Beam Compass Sold by Dietzgen

Description
This German silver instrument has two trammels, one with a reversible needle point and micrometer, and one with a holder for a pencil lead. The pencil holder may be replaced with an adjustable pen point. A rectangular wooden case is covered with morocco leather and lined with green silk and green velvet. The top of the case is marked: CE27RD. An indentation in the case indicates a piece is missing, possibly a container of pencil leads. Compare to 1978.2110.03.
The instrument resembles a beam compass sold by Dietzgen in two different grades from at least 1904 to 1934, first as model numbers 646C ($10.70) and 1034C ($6.60) and then as models 927 ($16.75) and 978 ($8.10). The case was lined with silk only in the 1904 catalog description, but the case of pencil leads was not mentioned until 1926. As with many beam compasses, purchasers had to separately buy a wooden bar to connect the trammels, in widths between 5/32" and 3/16" and lengths between 24" and 60".
References: Catalogue & Price List of Eugene Dietzgen Co., 7th ed. (Chicago, 1904), 71, 136; Catalogue & Price List of Eugene Dietzgen Co., 12th ed. (Chicago, 1926), 89–90; Catalogue & Price List of Eugene Dietzgen Co., 14th ed. (Chicago, 1934), 108–109.
Location
Currently not on view
Object Name
beam compass
date made
early 20th century
Physical Description
leather (overall material)
german silver (overall material)
wood (overall material)
steel (overall material)
velvet (overall material)
satin (overall material)
Measurements
overall: 13.1 cm x 6 cm x 2 cm; 5 5/32 in x 2 3/8 in x 25/32 in
place made
Germany
ID Number
1978.2110.02
accession number
1978.2110
catalog number
336728
subject
Science & Mathematics
Mathematics
Drawing Instruments
Dividers and Compasses
See more items in
Medicine and Science: Mathematics
Dividers and Compasses
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Ruth A. Ming
Additional Media

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