Easy Instructions for operating the Controlled-Key Comptometer
Book details
- Title
- Easy Instructions for operating the Controlled-Key Comptometer
- Publication year listed
- 1920
- 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., Chicago, Ill.
Year: 1920
Easy Instructions for operating the Controlled-Key Comptometer Adding and Calculating Machine Felt & Tarrant Mfg. Co., Chicago, Ill. 1920 22 page stapled booklet 184mm × 235mm This booklet is a simplified manual for using the Comptometer, containing only the basic methods that can be found in the "Methods of Operating the Comptometer" book. It explains addition, the "Controlled-Key" mechanism, multiplication, subtraction, and division. At the end it has a list of the various tables that were available for simplifying certain calculations.
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