Easy Instructions for operating the Controlled-Key Comptometer
Book details
- Title
- Easy Instructions for operating the Controlled-Key Comptometer
- Publication year listed
- 1930
- Format
- Public domain eBook
- Reading access
- Free online reader; no registration required
- Source record
- View on Archive.org
About this book
Easy Instructions for operating the Controlled-Key Comptometer
Author: Felt & Tarrant Mfg. Co.
Year: 1930
This is a simplified manual for the Comptometer mechanical calculator. This version has no copyright year, but shows the model H or J Comptometer on the first page. It could date anywhere from about 1921 to 1934, but I guess it is from 1930, and that this is the first version that was used as the new simplified standard manual, replacing the final 1928 version of "Methods of Operating the Comptometer". All the later versions use the same design for the front cover, apart from the colour.
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