Sheet, Form Letter Sent by D. E. Felt to Meteorological Observatory, New York, N. Y.

Sheet, Form Letter Sent by D. E. Felt to Meteorological Observatory, New York, N. Y.

Usage conditions apply
This typed form letter is addressed to the Meteorological Observatory in New York City (e.g. Daniel Draper) and stamped with the signature stamp of Dorr E. Felt. It announces the availability of the new model duplex Comptometer, and offers to send an example of the machine on trial.
The letter was received with a later model of the Comptometer (see MA.335357).
P. A. Kidwell, “American Scientists and Calculating Machines: From Novelty to Commonplace,” Annals of the History of Computing, 12, 1990, pp. 31-40.
Currently not on view
Object Name
date made
Felt & Tarrant Mfg. Co.
place made
United States: Illinois, Chicago
Physical Description
paper (overall material)
overall:.1 cm x 21.5 cm x 27.8 cm; 1/32 in x 8 15/32 in x 10 15/16 in
ID Number
accession number
catalog number
Credit Line
Gift of John William Christopher Draper and James Christopher Draper
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Adding Machines
Data Source
National Museum of American History
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