Scale Rule Signed Carl Zeiss

Description
This rectangular transparent glass ruler has a millimeter scale numbered by tens from 0 to 200. It is marked: Carl Zeiss, (/) Jena. The rule is cracked in the lower left corner. A tan envelope is made from folded paper.
In 1846 Carl Zeiss established a workshop in Jena, Germany, that became known for microscopes, telescopes, and photographic lenses. The firm sold this rule for making measurements on drawings and photographs for 5 marks at least as early as 1891. By 1902, it was numbered model 134 and described as a 20-cm rule instead of a 200-mm rule. The new price of 7 marks increased to 8 marks in 1906. The Department of Entomology at the National Museum of Natural History used this rule to study its collections.
References: Carl Zeiss Jena, Microscopes and Microscopic Accessories, 29th ed. (Jena, 1891), 75; 31st ed. (Jena, 1898), 75; 32nd ed. (Jena, 1902), 96; 33rd ed. (Jena, 1906), 79.
Location
Currently not on view
Object Name
rule
scale rule
date made
1891–1902
maker
Zeiss
Physical Description
glass (overall material)
Measurements
overall: .3 cm x 22.3 cm x 3.7 cm; 1/8 in x 8 25/32 in x 1 15/32 in
place made
Deutschland: Thüringen, Jena
ID Number
1990.0099.03
accession number
1990.0099
catalog number
1990.0099.03
subject
Mathematics
Rule, Measuring
Drawing Instruments
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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