Mathematical Table, Decimal Equivalents of Parts of an Inch

Companies seeking to provide customers with advertisements they might consult repeatedly sometimes distributed convenient mathematical tables. This is an example of one of these. The small white plastic card has figures printed in blue. The table gives decimal equivalents of parts of an inch ranging from 1/64” to 1” by sixty-fourth inch increments.
The other side of the card has a small drawing that shows the wooden building occupied by Brown & Sharpe Manufacturing Company of Providence, Rhode Island, in 1848. It also shows the plant at the time the table was distributed, when it occupied 33 acres.
A mark on the back of the table reads: FORM 93 M.M.T. 7-43:100. Another mark reads: PRINTED IN U. S. A. This mark suggests that the card dates from 1943.
This table was found in the collections of what was then the Division of Work and Industry at the National Museum of American History.
Compare 1988.3078.02.
Currently not on view
Object Name
mathematical table
date made
Brown & Sharpe Manufacturing Company
Physical Description
plastic (overall material)
overall: .1 cm x 5 cm x 11.2 cm; 1/32 in x 1 31/32 in x 4 13/32 in
place made
United States: Rhode Island, Providence
ID Number
catalog number
nonaccession number
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Measuring & Mapping
Mathematical Charts and Tables
Data Source
National Museum of American History, Kenneth E. Behring Center


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