Framed Letter Of Introduction for Herman Hollerith, 1880

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This handwritten letter of Francis A. Walker, superintendent of the Census, introduces Herman Hollerith, E.M., as a special agent of the Census Office for collecting statistics on power and machinery used in manufacture. The letter is dated March 18, 1880. The chief special agent was William P. Trowbridge, head of the Engineering Department at Columbia University, where Hollerith had studied.
This letter marks the beginning of Hollerith’s association with the Bureau of the Census.
date made
place made
United States: District of Columbia
Physical Description
wood (overall material)
glass (overall material)
paper (overall material)
overall: 2 cm x 39.7 cm x 46 cm; 25/32 in x 15 5/8 in x 18 1/8 in
ID Number
accession number
catalog number
Credit Line
Gift of Virginia Hollerith and Lucia Hollerith
Census, US
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Medicine and Science: Mathematics
Science & Mathematics
Tabulating Equipment
Data Source
National Museum of American History