Dividers & CompassesBeam Compasses
Mechanical and architectural drawings have sometimes required circles with diameters of several feet instead of the several inches possible with a standard drawing compass. A beam compass was usually sold with just the points, which the user attached to the ends of a metal rod or wooden slat the length of the desired radius of the circle. One end was held in place, and the other end was pivoted around that end, maintaining contact with the paper. The patent model in the collection is a beam compass.
"Dividers & Compasses - Beam Compasses" showing 1 items.
- This German silver instrument has steel points. Two rounded tubes (4" and 13" long) may be connected with a collar on the longer tube. A holder for a pricker point is on the shorter tube. It has a cylindrical handle with a crosshatch pattern and a micrometer adjustment that may be moved along a screw extending from the holder. The handle is marked: KEUFFEL & ESSER (/) GERMA[NY].
- A second holder may be placed anywhere on the tubes. It may be fitted with an adjustable pen point, a pencil point, or one of two needle points. The needle points fit into a cylindrical ridged handle, but the handle apparently cannot be attached to the tubes. A cylindrical metal case holds two pencil leads.
- An oblong black leatherette case is lined with green velvet and marked on the top of the lid: KEUFFEL & ESSER CO. (/) 955. The case is in a dark green paper box with a red and white label: ANVIL BEAM COMPASSES (/) TRADE MARK K & E CO. (/) 1 ONLY 955 C (/) REG. U.S. PAT. OFF. In 1936, K&E sold the instrument and case as part of its Anvil product line for $9.50. (The C in the model number refers to the case.) The description does not mention the handle for the needle points or the tube for the pencil leads, but there are spaces for both items in the case. This instrument was not advertised in the 1927 and 1944 K&E catalogs.
- Reference: Catalogue of Keuffel & Esser Co. , 38th ed. (New York, 1936), 157.
- Currently not on view
- date made
- ca 1936
- Keuffel & Esser Co.
- Keuffel & Esser Co.
- ID Number
- catalog number
- accession number
- Data Source
- National Museum of American History, Kenneth E. Behring Center