Felt Comptometer

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Felt Comptometer computing machine.

Keywords

machine, schematic, invention, Mr. D. E. Felt

Galleries

Calculators

Source

Francis Rolt-Wheeler, The Boy with the U.S. Inventors (Boston: Lothrop, Lee & Shepard Co., 1920) 97

Downloads

TIFF (full resolution)

2400×1047, 2.4 MiB

Large GIF

1024×446, 64.0 KiB

Medium GIF

640×279, 34.1 KiB

Small GIF

320×139, 12.4 KiB