Bruning 2090P Open Divided Scale

Description
This white and orange plastic rule has scales for 1/2" and 1" to the foot along its top edge on the front side. Between these scales is a scale divided to 1/2", numbered from left to right by twos from 0 to 8, and numbered from right to left by ones from 0 to 4. The bottom edge has scales for 1/8" and 1/4" to the foot. Between these scales is a scale divided to 1/8", numbered from left to right by fours from 0 to 44, and numbered from right to left by twos from 0 to 22. The top edge is marked: BRUNING 2090P. It is also marked: MADE IN U.S.A.
On the back, the top edge has scales for 3/8" and 3/4" to the foot. Between these scales is a scale divided to 3/8", numbered from left to right by twos from 0 to [1]2, and numbered from right to left by ones from 0 to 6. The bottom edge has scales for 1-1/2" and 3" to the foot. A brown leather sheath is marked: BRUNING.
Charles Bruning (1866–1931) was born in Denmark and immigrated to the United States. In Chicago during the 1890s, he became interested in the blue print business. In 1897, he set up his own blue printing company in Manhattan, which was incorporated as the New York Blue Print Paper Company in 1901. Around 1920 he purchased American Blue Print Company of Chicago, and the combined firms became known as the Charles Bruning Company, Inc.
By 1936, the firm was offering model 2090 in boxwood and with plastic edges over boxwood. It began to make the rule from molded plastic in 1948, but it did not give the rule model number 2090P until 1952, when the rule sold for $1.80. According to the donor, the instrument was used by her husband, the electrical engineer Robert H. Wieler (1923–1993). For other open divided or chain scales, see 1998.0032.08, 1981.0933.14, 1981.0933.15, and 1992.0433.04.
References: "Charles Bruning," New York Times (January 31, 1931), 14; Charles Bruning Company, Inc., General Catalog, 12th ed. (New York, 1936), 120; Charles Bruning Company, Inc., General Catalog, 14th ed. (New York, [1948]), 88; Charles Bruning Company, Inc., General Catalog, 15th ed. (Teterboro, N.J., and Chicago, 1952), 115; accession file.
Location
Currently not on view
date made
after 1952
maker
Charles Bruning Company
place made
United States: Illinois, Chicago
Physical Description
plastic (overall material)
leather (overall material)
Measurements
overall: 1 cm x 8 cm x 3.5 cm; 13/32 in x 3 5/32 in x 1 3/8 in
ID Number
1998.0032.09
catalog number
1998.0032.09
accession number
1998.0332
Credit Line
Gift of Norma P. Wieler
subject
Mathematics
Drafting, Engineering
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Scale Rules
Data Source
National Museum of American History, Kenneth E. Behring Center

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