#
Slide RulesLinear Slide Rules

Between 1614 and 1622, John Napier discovered logarithms, Edmund Gunter devised a scale on which numerals could be multiplied and divided by measuring the distance between two logarithmic numbers with a pair of dividers, and William Oughtred put two such scales alongside each other, moving one on a slide so that the distance between the numbers could be read off directly. The speed with which these developments unfolded suggests the power that logarithms provided for reducing the tedium of calculation. By the 1680s, the English used slide rules in carpentry and in gauging (estimating liquid volumes)—the instruments were quite helpful for determining excise taxes on barrels of liquor.

It was not until the late eighteenth century that slide rules were commonly utilized in the manufacture of machines and machine tools, most notably by James Boulton and James Watt. Several more decades passed before slide rule use became widespread throughout Europe. French artillery officer Amedée Mannheim fostered acceptance of the rectangular or linear form of the instrument in 1851 by standardizing the general types of scales and the order in which the scales were arranged. Mannheim also developed the cursor or indicator, which made it easier to read results from two scales that were not adjacent to each other. By the 1870s, German companies made slide rules one of the first consumer products to be fashioned out of plastic (specifically, sheets of celluloid laminated to a wooden frame), and they built dividing engines that permitted mass production of the scales engraved on slide rules. In the United States in the 1890s, Keuffel & Esser of New York City pioneered first the import and then the domestic manufacture of linear slide rules. Numerous other companies entered the market in the 20th century.

A quick tour of what you can expect to see on a slide rule starts with the C and D scales, which both represent the standard number line. To multiply two numbers, set the 1 on the C scale above the first number to be multiplied on the D scale. Look at the second number to be multiplied on the C scale; the number below it on the D scale is the answer. For example, to multiply 2 by 3, set 1 on C over 2 on D, and then look below 3 on C to see the answer 6 on D. Division is accomplished by reversing the process. To calculate 6 ÷ 3, set 3 on C over 6 on D, then look at 1 on C to see the answer 2 on D. To deal with numbers larger than 10 or smaller than 1, the user must mentally move the decimal point. Slide rule users also had to be able to estimate distances between marks on the scales, since there was no way to include all of the digits needed to solve a problem such as 3.14 X 2.7. (On linear and circular slide rules, the answer is "approximately 8.48." Web sites on the Resources page provide more detailed training in using slide rules.)

The basic process for setting up and solving problems is the same for operations on other scales. If the numbers used in the calculation produce a result off the ends of the scales, a user employs the CI and DI scales, which put the number line in inverse, or reverse, order. If the numbers still extend past the end of the instrument, the user may try the "folded" CF and DF scales, which start numbering at π instead of at 1. The A and B scales are number lines of squares, so they are used with the C or D scales to square (or take the square root of) a number. The K scale provides cubes and cube roots. L scales represent common logarithms, S scales give sines and cosines, and T scales indicate tangents.

"Slide Rules - Linear Slide Rules" showing 56 items.

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## Lewis & Briggs Four-Sided Gauger's Slide Rule

- Description
- This is an eight-inch, four-sided boxwood slide rule used for measuring and taxing barrels of liquid. On one end of the rule, the slides on each side have been labeled with the four Roman numerals, I, II, III, and IV. On side I, the base has logarithmic scales that run from 1 to 8 and from 8 to 100. It is labeled Seg S
^{t}(Segments Standing) at the top left and SS at the bottom right. The slide has two identical C scales, logarithmically divided from 1 to 9. This side was used to estimate the volume of a barrel that was standing vertically and partially filled. The back of the slide lists calculating factors used in computing taxes on various liquors. For instance, the duty on one barrel of vinegar was equivalent to the duty on 7.56 barrels of small beer.

- On side II, the base has logarithmic scales that run from 0 to 4 and from 4 to 100. The bottom right corner is labeled SL (Segments Lying) for estimating the volume of a partially filled barrel lying on its side. The slide has two identical B scales, logarithmically divided from 1 to 10. The point 231 is marked W, showing the number of cubic inches in a wine gallon, and pi (314) is marked with a C. The back of the slide has a table of gauge points for converting between volumes in cubic inches and numbers of gallons for substances in square or circular containers.

- On side III, the base has an A scale, logarithmically divided from 1 to 10, and an MD (Malt Depth) scale that runs logarithmically in the opposite direction from somewhat less than 3 to 20. Point 2150 on the A scale is marked MB, for the number of cubic inches in a malt bushel, and point 282 is marked A, for the number of cubic inches in an ale gallon. The slide has two identical B scales, logarithmically divided from 1 to 9. The back of the slide has a scale of inches, a scale labeled Spheroid, and a scale labeled 2
^{d}Variety. These scales are for determining the diameters of two different shapes of barrels. Underneath the slide is marked: LEWIS & BRIGGS : Makers. N^{o}. 52. BOW. LANE. Cheapside. LONDON.

- On side IV, the base has a D scale, logarithmically divided from 1 to 3.2 and from 3.2 to 10. Point 17.15 is marked WG, for the diameter in inches of a cylinder that contains one gallon of wine when filled to a depth of one inch. Point 18.95 is marked AG for the diameter of a cylinder containing one gallon of ale. Point 46.3 is marked MS, for the side of a square vessel that contains a solid bushel per inch of depth, and point 52.32 is marked MR, for the side of a square vessel that contains a malt bushel per inch of depth.

- The slide has two identical C scales, logarithmically divided from 1 to 10. The back of the slide has a table of divisors for converting between volumes in cubic inches and numbers of gallons for substances in square or circular containers. The numbers in this table are squares of the gauge points in the table on the back of the slide on side II. Underneath the slide is marked: Will
^{m}. Wright : April. 30. 1795.

- According to Gloria Clifton, the firm of Lewis & Briggs operated in London from at least 1795 to 1799. The Smithsonian acquired this object in 1961.

- References: Colin Barnes, "The Customs and Excise Gauging Slide Rule,"
*Journal of the Oughtred Society*4, no. 2 (1995): 53–57; Ron Manley, "Gauging," http://www.sliderules.info/a-to-z/gauging.htm; Gloria Clifton,*Directory of British Scientific Instrument Makers*(London: National Maritime Museum, 1995), 167.

- Location
- Currently not on view

- Currently not on view

- Currently not on view

- date made
- 1795

- maker
- Lewis & Briggs

- ID Number
- MA*319510

- catalog number
- 319510

- accession number
- 239015

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## Routledge's Engineer Linear Slide Rule

- Description
- This is a two-foot, two-fold boxwood rule with a brass hinge and endpieces. Half of one side is a slide rule with A and D scales on the base and B and C scales on the slide. As with MA*306697.01, the C scale is the same as the A and B scales (the square of the D scale), instead of the same as the D scale, as on modern Mannheim slide rules. Below the D scale is marked: SQUARE CYLINDER GLOBE (3 times) ROUTLEDGE'S ENGINEER.

- The first three marks form headings for the tables on the other half of this side when the instrument is folded. The tables give conversion factors from the volumes of geometric solids to units of volume, in both the "old" and imperial systems; conversion factors from the volumes of geometric solids to the weights in pounds of various substances; the areas of polygons from 5 to 12 sides; the gauge points of a circle; and gauge points for pumping engines, to find the diameters of steam cylinders that will work pumps of specified diameter at 7 pounds per square inch.

- The other side has a scale of 24 inches along one edge, divided to sixteenths of an inch for 9 inches and to eighths of an inch for the rest of the scale. There are also scales for making scale drawings that are 1, 3/4, 1/2, and 1/4 inches to the foot. This side is marked: T. ASTON THE ORIGINAL MAKER WARRANTED. One outside edge has scales for 10 and 12 parts to the inch; the other outside edge divides one foot into 100 parts.

- This form of slide rule was invented by Joshua Routledge, a seller of iron goods, in 1808 or 1809. He discussed it in the 1813 (4th) edition of
*Instructions for the Engineer's Improved Sliding Rule*. According to Gloria Clifton, there were two rule makers named Thomas Aston, presumably a father and son, who were in business at various addresses in Birmingham, England, from 1818 to 1862. The references to pre-imperial system units of measure suggest the rule might have been made shortly after the imperial system was adopted in 1824. This instrument was found in the home of Grace Speer, granddaughter of Alfred Speer (1823–1910), an inventor and wine merchant in Passaic, N.J.

- References: John V. Knott, "Joshua Routledge 177[3]–1829,"
*Journal of the Oughtred Society*4, no. 2 (1995): 25; Philip E. Stanley, "Carpenters' and Engineers' Slide Rules: Routledges' Rule,"*Chronicle of the Early American Industries Association*37, no. 2 (1984): 25–27; Gloria Clifton,*Directory of British Scientific Instrument Makers*(London: National Maritime Museum, 1995), 11–12; accession file.

- Location
- Currently not on view

- Currently not on view

- date made
- 1824-1862

- maker
- Aston, T.

- ID Number
- 1981.0934.01

- catalog number
- 1981.0934.01

- accession number
- 1981.0934

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## Four-Sided Gauger's Slide Rule by Cook

- Description
- This is a twelve-inch, four-sided boxwood slide rule used in England for measuring and taxing barrels of liquid. Each of the four slides has a brass guide at one end, and the various special points on the rules are marked with inset brass pegs. On one side, the base has a D scale, logarithmically divided from 1 to 3.2 and from 3.2 to 10. Point 18.789 is marked G, the circular gauge point, for determining the mean diameter of a barrel. Point 46.3 is marked MS, for the side of a square vessel that contains a solid bushel per inch of depth, and point 52.32 is marked MR, for the side of a square vessel that contains a malt bushel per inch of depth. The slide has two identical B scales, logarithmically divided from 1 to 10. Point 277.42 is marked G for the imperial gallon.

- On the second side, the base has logarithmic scales that run from 1 to 8 and from 8 to 100. It is labeled SEG
^{T}S^{T}(Segments Standing) at the top left and SS at the bottom right. The slide has two identical C scales, logarithmically divided from 1 to 9. This side was used to estimate the volume of a barrel that was standing vertically and partially filled. The back of the slide lists gauge points, divisors, and factors for circles for malt and for gall (another substance used in making alcoholic beverages) in circular and square containers.

- On the third side, the base has an A scale, logarithmically divided from 1 to 10, and an MD (Malt Depth) scale that runs logarithmically in the opposite direction from somewhat less than 3 to 20. Point 2219 is marked B, for the number of cubic inches in a bushel under the imperial system of measurement, and point 277.42 is marked G, for the imperial gallon. The slide has two identical C scales, logarithmically divided from 1 to 9. The back of the slide has a scale of inches, a scale labeled SPH[EROI]
^{D}, and a scale labeled 2^{D}VAR[IETY]. These scales are for determining the diameters of two different shapes of barrels. Underneath the slide is marked: COOK. MAKER TO THE HON^{BLE}BOARD OF EXCISE. LATE*WELLINGTON*CROWN COURT SOHO*LONDON*N^{O}2950.

- On the fourth side, the base has logarithmic scales that run from 0 to 4 and from 4 to 100. It is labeled SEG
^{T}L^{Y}(Segments Lying) at the top left and SL at the bottom right. The slide has two identical B scales, logarithmically divided from 1 to 9. Underneath the slide, points 3.9 and 99 are connected by a line marked with H.

- The use of the Imperial system of units dates this slide rule to after 1824. It is of the style developed by Thomas Everard in 1683 and, at 12 inches, represents one of the two standard "pocket" sizes (the other was 9"). Laban Cook(e) succeeded Alexander Wellington (d. 1825) as a Maker to the English Board of Excise and remained in business until 1834. Compare to the older rule for gauging and ullage (the amount a container is lacking to be full), MA*319510.

- References: D. Baxandall,
*Catalogue of the Collections in the Science Museum: Mathematics I. Calculating Machines and Instruments*(London, 1926), 42; Colin Barnes, "The Customs and Excise Gauging Slide Rule,"*Journal of the Oughtred Society*4, no. 2 (1995): 53–57; Peter M. Hopp,*Slide Rules: Their History, Models, and Makers*(Mendham, N.J.: Astragal Press, 1999), 72, 245; Gloria Clifton,*Dictionary of British Scientific Instrument Makers*(London: National Maritime Museum, 1995), 64.

- Location
- Currently not on view

- Currently not on view

- date made
- 1825-1834

- maker
- Cook, Laban

- Cook

- ID Number
- 1980.0588.04

- catalog number
- 1980.0588.04

- accession number
- 1980.0588

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## Hawthorn's Mechanics' Slide Rule

- Description
- From the late 18th to the mid-19th centuries, British engineers began to use slide rules. This ivory and silver instrument is a four-fold engineer's rule that unfolds to a length of 24 inches. On half of one side is a slide rule with A and D scales on the base and B and C scales on the slide. The A and D scales seem to run continuously, although the slide only moves on the second six inches of the rule.

- The words IRON and ROPE appear several times along the edge of the A scale. Along the edge of the D scale is marked: DESCRIPTION SQUARE CYL[I]ND[ER] GLOBE SQUARE CYL[I]ND[ER] WEIGHT STRAIN WORK INCLIN[E] POLYGON SIDE GOVERNORS H[ORSE]P[OWER] ENGIN[E]S STE[A]M TEM[PERATURE]. When the rule is folded, these markings correspond to the tables on the other half of the instrument.

- The other half of this side has a table of gauge points for the A scale. Instructions printed on the rule suggest that calculations on the slide rule were intended to be made with calipers. Additional tables and instructions for working with ropes and chains are on this half, which is marked: IMPROVED & ARRANG[E]D (/) BY R
^{T}HAWTHORN (/) CIVIL ENGINEER (/) NEWCASTLE TYNE.

- The other side has a scale of 24 inches divided to eighths of an inch along the edge. The metal joint has a protractor divided in increments of 5 degrees and marked by tens from 0 to 180. When the instrument is folded around the joint, there are tables for the extreme strain possible in bars and beams of various substances and for equivalent measures. The joint is marked: G. R. STEPHENSON (/) ENGINEER (/) Adam Pensom.

- In 1832 civil engineer Robert Hawthorn (1796–1867) designed a new form of slide rule for manufacturing locomotives and other engines. In 1859 dealers sold the rule for 5 shillings and 6 pence. The names on the joint may refer to the British civil engineer George Robert Stephenson (1819–1905), nephew to the engineer George Stephenson (1781–1848), who sought mechanical advice from Hawthorn's father, and to Adam Pensom (b. 1824), who was a retired gas engineer living in London, according to the 1881 British census. The Smithsonian acquired this object in 1973.

- References: Robert Hawthorn,
*Instructions for the Use of the Mechanics' Sliding Rule*(Newcastle-upon-Tyne, 1841), available online at http://www.physics.uq.edu.au/physics_museum/hawthorne/; "Mr. Robert Hawthorn,"*Minutes of the Proceedings of the Institution of Civil Engineers*27 (1867–1868): 590–592; advertisement by John Archbutt,*The Mechanics' Magazine*, n.s., 1, no. 10 (March 4, 1859): 486; Peter M. Hopp,*Joint Slide Rules*(Jeremy Mills Publishing: Lindley, Huddersfield, West Yorkshire, 2009).

- Location
- Currently not on view

- date made
- after 1832

- maker
- Hawthorn, Robert

- ID Number
- MA*306697.01

- accession number
- 306697

- catalog number
- 306697.01

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## Carpenter's Slide Rule by S. A. Jones

- Description
- One of the first types of slide rules sold and made in the United States was the carpenter's rule, used for calculations relating to timber, which was one of the country's major early exports. This rule is marked on the lower arm: S. A. JONES & CO. (/) HARTFORD–CON. (/) WARRANTED BOX WOOD. Solomon A. Jones made carpentry tools in Hartford, Conn., from 1838 to 1841. Compare to 1987.0771.01, a British carpenter's rule of the same period. The collections include an image of someone holding the rule (see 2003.0215.02).

- This boxwood carpenter’s rule has a brass joint, metal caps at the ends of the arms, and a brass slide. The front of the slide has two identical logarithmic scales labeled B and C. Above is an identical logarithmic scale on the arm; this scale is labeled A. All three of these scales have a double cycle of logarithms, like the A and B scales on a Mannheim rule. Below the C scale on the arm is a scale labeled D and also GIRT LINE, which is divided logarithmically and runs from 4 to 40 (in other words, this is not the D or principal scale of Mannheim slide rules). The girt line can be used with other scales to estimate the volume of timber available from a log.

- Underneath the slide is imprinted the number 33. The back of the slide is also stamped with the number 33 and is somewhat crudely marked with a twelve-inch ruler, divided to eighths of an inch. The lower arm contains scales for making scale drawings that are 1/4, 1/2, 3/4, and 1 inch to the foot. The units on the 1/4-inch chain scale appear to be numbered erroneously after 18 (e.g., the next numbered division after 18 is 10 rather than 20). Along the edge is another twelve-inch scale, divided to eighths of an inch.

- The other side of the rule has a scale of 24 inches along one edge, divided to sixteenths of an inch. One arm has a scale labeled by twos from 34 to zero and is marked M. A number for 31 is between 32 and 30, and the number for 6 is omitted.

- The other arm has a scale marked E and labeled by twos from 24 to zero. The number 24 appears twice, and 6 is omitted. The M and E scales were used in cutting polygonal sections of wood. The outside edge has two scales, each dividing one foot into 100 parts.

- References: Kenneth D. Roberts,
*Introduction to Rule Collecting*(Hartford, Conn.: The Bond Press, Inc., 1982); "Solomon A. Jones & Co.,"*The Davistown Museum*, http://www.davistownmuseum.org/bioSAJones.html.

- Location
- Currently not on view

- date made
- 1838-1841

- maker
- S. A. Jones & Co.

- ID Number
- 2003.0216.01

- accession number
- 2003.0216

- catalog number
- 2003.0216.01

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## Stanley Slide Rule Invented by James Hogg

- Description
- By the late 19th century, several American inventors proposed special-purpose slide rules. One of them was James Hogg (1851–1930), an English mechanical engineer who came to the United States in 1880 and soon was overseer at the Globe Worsted Mill in Lawrence, Mass. During his time in Lawrence, Hogg devised this slide rule and arranged to have it manufactured by the Stanley Rule & Level Company of New Britain, Conn. He went on to patent a spindle for spinning machies (U.S. Patent 401,703) and feeding mechanisms for carding machines (U.S. Patents 562,610; 686,071; and 686,072).

- This instrument is a wooden linear slide rule with a metal slide and metal edges on all four sides. The scales on the top of the base are lettered A, B, and C; the scales on the slide are lettered D and E; and the scales on the bottom of the base are lettered F, NUM, and LOG. The A and NUM scales range from 1 to 10, divided logarithmically. The B, C, D, and E scales range from 1 to 10 and then from 1 to 10 again, divided logarithmically. The F scale is divided like the B, C, D, and E scales, but runs in the opposite direction. The LOG scale is a scale of equal parts, ranging from 1 to 100 and divided in increments of one-half. The back of the slide is a twelve-inch scale divided to tenths of an inch and to eighths of an inch.

- The back of the rule also has a twelve-inch scale divided to tenths of an inch on one edge and a twelve-inch scale divided to eighths of an inch on the other edge. In between are tables providing conversion factors from the volumes of geometric solids to cubic inches and feet; conversion factors from the volumes of geometric solids to the weights in pounds of various substances; the areas of polygons from 5 to 12 sides; the gauge points of a circle; and gauge points for pumping engines, to find the diameters of steam cylinders that will work pumps of specified diameter at 7 pounds per square inch. Compare to 1981.0934.01.

- The back is marked: PAT. APPLIED FOR IMPROVED SLIDE RULE (/) ARRANGED & CONSTRUCTED BY (/) JAS. HOGG LAWRENCES MASS. U.S.A. (/) MANUFACTURED BY (/) STANLEY RULE & LEVEL CO. NEW BRITAIN, CONN. No patent has been found for the instrument.

- Hogg moved from Lawrence in 1888 and subsequently worked for Stephen Sanford & Sons, Inc., in Amsterdam, N.Y., and the Bigelow Carpet Company in Lowell, Mass. An 1888 advertisement reported that the rule and instruction book sold together for $4.00. The instrument was still on sale in 1908, with instruction book, for a price of $3.50.

- References: James Hogg,
*A Practical Course in Instruction with Hogg's Improved Slide-Rule in Arithmetic and Mensuration*(Boston: Rand, Avery Co., 1887); "James Hogg,"*Transactions of the American Society of Mechanical Engineers*52 (1930): 77; "Hogg's Improved Slide Rule,"*Wade's Fibre & Fabric*7, no. 182 (August 25, 1888): 203, 209; "New Publications,"*Textile World Record*36 (1908): 631; Thomas Wyman, "Slide Rules of the Stanley Rule & Level Company and other American Makers,"*The Chronicle of the Early American Industries Association*54, no. 3 (2001): 114–117.

- Location
- Currently not on view

- date made
- 1880-1888

- maker
- Stanley Rule and Level Company

- ID Number
- 1991.0556.01

- catalog number
- 1991.0556.01

- accession number
- 1991.0556

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## Tavernier-Gravet Mannheim Simplex Slide Rule

- Description
- This eight-inch wooden Mannheim linear slide rule is coated with white celluloid and has a brass indicator in the single chisel style. It has no endpieces. The top edge is beveled and has a scale of 20 centimeters, divided to millimeters. A 20-centimeter scale, divided to millimeters, is on the front edge. A third 20-centimeter scale under the slide is numbered from 22 to 41.

- The top of the base has a scale divided logarithmically from 1 to 10 twice. The bottom of the base has a scale divided logarithmically from 1 to 10. These are the usual A and D scales, although they are not lettered. One side of the slide has the same two scales (the usual B and C scales, although they are not lettered). The other side of the slide has a scale of tangents that runs from 0 to 45 degrees and is lettered T; a scale of equal parts that runs from 0 to 10 and divides every two centimeters into 50 increments; and a scale of sines that runs from 70 to 0 and is lettered S. Compare to MA*318474. There is a place on the back of the instrument for a table of physical constants, but there is no table.

- The top of the base is marked: TAVERNIER-GRAVET. The bottom of the base is marked: RUE MAYET 19.PARIS. It is also marked there: KEUFFEL & ESSER Co NEW-YORK & CHICAGO. The back is marked: MÉDAILLES D'OR 1878 ET 1889.

- The British engineer's rule was brought to France by Edme-François Jomard in 1815, and by around 1820 Paul-Etienne Lenoir was manufacturing them in Paris. Lenoir's firm was succeeded by Gravet-Lenoir and later Tavernier-Gravet. From about 1851, Tavernier-Gravet manufactured a slide rule on the design of Amédéé Mannheim; this is such a slide rule. It was made after Tavernier-Gravet was awarded gold medals at world's fairs held in Paris in 1878 and 1889.

- Before Keuffel & Esser manufactured its own rules around the turn of the 20th century, the company sold slide rules from Tavernier-Gravet and from Dennert & Pape of Germany. (Additional company history is provided with MA*318477, MA*318478, and MA*326613.) Although the scales and indicator resemble the ten-inch model 479–2 (subsequently numbered 1746N and 1746), a rule of this length (scales about 8" long) is not listed in K&E catalogs. The ten-inch version with brass indicator cost $4.50 between 1883 and 1890. In 1892 the single-chisel indicator was replaced with a double-chisel indicator.

- References: Florian Cajori,
*A History of the Logarithmic Slide Rule and Allied Instruments*(New York: Engineering News Publishing Company, 1909), 55–58, 80–81; M. Jomard, "The Slide Rule in France—1815," trans. Francis Wells,*Journal of the Oughtred Society*8, no. 2 (1999): 11–16;*Catalogue of Keuffel & Esser*, 17th ed. (New York, 1883), 93;*Catalogue of Keuffel & Esser*, 20th ed. (New York, 1887), 129;*Catalogue of Keuffel & Esser*, (New York, 1890), 131.

- Location
- Currently not on view

- date made
- 1889-1892

- maker
- Tavernier-Gravet

- ID Number
- MA*318473

- accession number
- 235479

- catalog number
- 318473

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## A. W. Faber Mannheim Simplex Slide Rule

- Description
- This one-sided, ten-inch wooden rule has a layer of yellowed white celluloid on the front side. It has unlettered A and D scales on the base and B and C scales on one side of the slide. The other side of the slide has S, L, and T scales. The indicator is glass in a metal frame. The top edge is beveled and has a 25-centimeter scale, divided to millimeters. A second scale, 26 centimeters in length, is on the front edge. Underneath the slide is a third centimeter scale, numbered from 27 to 51.

- The bottom of the base is marked in gold: A. W. FABER. Tables of equivalent measures and lists of constants (in German) are printed on paper glued to the back of the instrument. The rule is in a cardboard case covered with black leather, which is in excellent condition. The case is marked: Rechenstab (/) von (/) A. W. Faber. The back of the case is signed illegibly in pencil.

- A. W. Faber began manufacturing wooden slide rules in 1882 and added celluloid facings in 1887. From about 1888 to 1900, the rules were often marked not only "A. W. FABER" but "Made in Germany." The metal indicator with a glass window was introduced in 1889. Although there is no model number on this rule, in the 1910s this combination of scales and indicator was sold as model 360. See MA*304722.02 for a later version of this rule, which mentions an 1899 patent and has a digit registering indicator introduced in 1905.

- Reference: Dieter von Jezierski,
*Slide Rules: A Journey Through Three Centuries*, trans. Rodger Shepherd (Mendham, N.J.: Astragal Press, 2000), 54, 90; Trevor Catlow, "Suggestions for Dating pre-1920 Faber Castell Slide Rules,"*Journal of the Oughtred Society*18, no. 2 (2009): 46–53; "Time Line for A. W. Faber and Faber-Castell," http://sliderulemuseum.com/SR_Dates.htm#Faber.

- Location
- Currently not on view

- date made
- about 1890

- maker
- Faber, A. W.

- ID Number
- MA*314793

- catalog number
- 314793

- accession number
- 210147

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## A. W. Faber Mannheim Simplex Slide Rule

- Description
- This one-sided, ten-inch wooden rule has a layer of white celluloid on the front side. It has unlettered A and D scales on the base and B and C scales on one side of the slide. The other side of the slide has lettered S, L, and T scales. The bottom left corner is marked: QUOTIENT (/) +1. The bottom right corner is marked: PRODUCT (/) –1. The indicator is glass in a metal frame, with a circular scale and pointer on the right side of the frame for registering digits to be added or subtracted during the calculation. The top edge is beveled and has a 25-centimeter scale, divided to millimeters. A second scale, 27 centimeters in length, is on the front edge. Underneath the slide is a third centimeter scale, numbered from 30 to 55.

- The bottom of the base is marked in gold: A. W. FABER. D.R.G.M. 98350 & 116832. A set of tables of equivalent measures printed in German on paper is glued to the back of the instrument. The rule is in a cardboard case covered with black leather. The case is marked: Rechenstab (/) von (/) A. W. Faber. Inside the case is written in pencil: Mit Anlistz (/) [illegible] 10 (/) R. C. Archibald. On the back of the inside is written in pencil: RCA.

- A. W. Faber was a German company that began manufacturing slide rules in 1882 and introduced this form of instrument around 1894. German patent 116832 was issued to A. W. Faber in June 1899. The digit-registering cursor was added in 1905. Although there is no model number on this rule, it was sold as model 367 from 1905 to 1913. The firm was renamed Faber-Castell in 1905, although instruments continued to be marked "A. W. Faber" as late as 1913.

- This slide rule reflects the rich intermixture of cultures that characterizes the American mathematical community. It was owned by Raymond C. Archibald (1875–1955), a Canadian born in Nova Scotia. He began his college education in Canada and completed a bachelor's and a master's degree from Harvard University in Cambridge, Mass. Then, like several other late 19th- and early 20th-century North American mathematicians, Archibald traveled to Germany, spending the academic year 1898–1899 at the University of Berlin and 1899–1900 at the University of Strasbourg. He obtained his Ph.D. in Strasbourg in 1900 and may have purchased this slide rule near the end of this European sojourn. Archibald then returned to Canada, where he taught for several years before joining the faculty of Brown University in Providence, R.I., in 1908. He remained at Brown for the rest of his academic career. Archibald's wide ranging interests included the history of mathematics, the computation of mathematical tables and the development of computing tools. In 1943, he became the founding editor of the journal
*Mathematical Tables and Other Aids to Computation*, a publication that included some of the first articles published about electronic computers.

- References: Peter M. Hopp,
*Slide Rules: Their History, Models, and Makers*(Mendham, N.J.: Astragal Press, 1999), 25–26, 41; Dieter von Jezierski,*Slide Rules: A Journey Through Three Centuries*, trans. Rodger Shepherd (Mendham, N.J.: Astragal Press, 2000), 24; George Sarton, "Raymond Clare Archibald,"*Osiris*12 (1956): 4–34; Charles N. Pickworth,*Instructions for the Use of A. W. Faber's Improved Calculating Rule*(New York: A. W. Faber, [after 1900]), 36–40. This work is undated, but it refers to a prize awarded to Faber at the Exposition universelle held in Paris in 1900. The pages cited describe "a new form of A. W. Faber's calculating rule," the form of the slide rule catalogued here.

- Location
- Currently not on view

- date made
- 1900-1908

- maker
- Faber, A. W.

- ID Number
- MA*304722.02

- accession number
- 304722

- catalog number
- 304722.02

- Data Source
- National Museum of American History, Kenneth E. Behring Center

## Keuffel & Esser 4078 Duplex Slide Rule

- Description
- This 20-inch mahogany linear slide rule is coated on the front and back with white celluloid; the edges are bare. The scales are labeled on the right end of each side. On both sides, the top of the base has an A scale, and the bottom of the base has a D scale. On one side, the slide has B and C scales; on the other, the slide has BI and CI scales. The rule has two indicators: the original brass double-chisel style indicator, and the frameless glass with plastic edges that Keuffel & Esser adopted in 1915. According to the donor, the second indicator was acquired some years after the original slide rule.

- The bottom of the base on one side and the chisel indicator on the other side are both marked: KEUFFEL & ESSER Co. NEW-YORK. The bottom of the base is also engraved: CHAS. C. BRUSH 1901. The symbol for pi has also been scratched on the D scale on that side. On the other side, the bottom of the base is marked: PAT. OCT. 6. 1891. One edge of the frameless indicator is marked: K&E.CO.N.Y. (/) PAT.8.17.15. For information on these patents, see MA*318477 and MA*318475.

- The cardboard case is covered with brown morocco leather. It is marked: KEUFFEL & ESSER CO. (/) DUPLEX (/) SLIDE RULE. See the similar case for MA*326613.

- According to the donor, the instrument was used by his father, Charles C. Brush (1880–1968), who graduated from high school in Philadelphia in 1898 and subsequently studied at the Franklin Institute. He received a certificate from the School of Naval Architecture there in 1904. The model 4078 is only listed in Keuffel & Esser catalogues for 1901 and 1903, priced at $16.50. The catalog evidence and the date on the slide rule make it reasonable to suppose that Brush acquired the slide rule in the course of his studies. Charles C. Brush was then associated with the Bureau of Lighthouses from 1917 to 1939. When the Lighthouse Service ended in 1939, he served as a marine engineer in the engineering department of the U.S. Coast Guard until his retirement in 1944.

- References:
*Catalogue of Keuffel & Esser Co.*, 30th ed. (New York, 1900–1901), 296;*Catalogue of Keuffel & Esser Co.*, 31st ed. (New York, 1903), 306; accession file.

- Location
- Currently not on view

- date made
- 1901-1903

- maker
- Keuffel & Esser Co.

- ID Number
- 1977.0370.01

- accession number
- 1977.0370

- catalog number
- 335926

- Data Source
- National Museum of American History, Kenneth E. Behring Center