On 27 April 1961 the Rockwell Manufacturing Company donated two voting machines to the U.S. National Museum. This letter includes a description of the machines, the first of which was an adaptation of a machine from 1892. The second item on the memo is the 1898 Standard voting machine.
Accession Memorandum for the 1898 Standard Voting Machine (Item No. 227298), April 27, 1961, Office of the Registrar, National Museum of American History.