How to use the calculator and the comptometer.
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How to use the calculator and the comptometer. by James Robert Meehan

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Published by Gregg Pub. Division, McGraw-Hill in New York .
Written in English

Subjects:

  • Calculators.,
  • Comptometers.

Book details:

Classifications
LC ClassificationsQA75 .M37 1959
The Physical Object
Pagination140 p.
Number of Pages140
ID Numbers
Open LibraryOL6226445M
LC Control Number57012908
OCLC/WorldCa3383006

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Invented in the late 19th century, this calculator became very popular and went through numerous versions and improvements. Built as a business machine, the manufacturer, Felt and Tarrant, realized that they could sell more units if businesses could also hire people expert in their use.   Using a comptometer to do sums in the s An advertisement in for an early comptometer, the first mass-produced calculator Photo: GETTY IMAGES AM BST 05 Apr Trove: Find and get Australian resources. Books, images, historic newspapers, maps, archives and more. Reproduction Calculator Manuals. This little manual gives basic instructions and practice examples for calculating on the Comptometer (any model). The book begins with basic 2-finger exercises, then proceeds through various techniques for addition, multiplication, subtraction, and division. Instructions for the use of the Fuller.

  Easy Instructions for operating the Controlled-Key Comptometer Adding and Calculating Machine Felt & Tarrant Mfg. Co., Chicago, Ill. 22 page stapled booklet mm × mm 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. How to Use the Calculator and the Comptometer. Published by Gregg Publishing Division, McGraw-Hill Book Company, Inc., 1–4 This article was originally published on : Francesco Bertelli. The ANITA Mark VII and ANITA Mark VIII calculators were launched simultaneously in late as the world's first all-electronic desktop calculators. Designed and built by the Bell Punch Co. in Britain, and marketed through its Sumlock Comptometer division, they used vacuum tubes and cold-cathode switching tubes in their logic circuits and nixie tubes for their numerical displays. The journal 'Management in Action' in explained the speed advantage of the Comptometer over the key electronic calculator when adding lists [3]: "An electronic calculator is not a substitute for an adding machine, and particularly it is not a substitute for the key-driven machines of the Comptometer, Duplex, or Plus-adder types when they are used in an adding role.