Framed Letter Of Introduction for Herman Hollerith, 1880

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.
Object Name
date made
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
place made
United States: District of Columbia
ID Number
accession number
catalog number
Census, US
Science & Mathematics
Tabulating Equipment
See more items in
Medicine and Science: Mathematics
Tabulating Equipment
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Virginia Hollerith and Lucia Hollerith
Additional Media

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