Comptometer manual

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. These efforts led to the detailed instruction and training manuals that soon accompanied the machines, and culminated in with the publication of his treatise on "Applied Mechanical Arithmetic as practised on the Comptometer". This page volume addressed every conceivable business and commercial calculation and showed how it could be accomplished . The instruction manual for the Felt Tarrant "Comptometer" was first produced in the s, and was progressively updated to cover the new features of subsequent models. This very comprehensive edition was produced in for the Model J Comptometer, but still contains sections of text from and illustrations from

Called the Comptometer by Felt, Burroughs referred to this type machine as the key-driven calculator. The key-driven type machine did not print, and while it was often used as an adding machine, it developed into a special purpose machine in later years. Museum Artifact: Victor Adding Machine - Series, c. Made By: Victor Adding Machine Company, N. Rockwell St., Chicago, IL [North Center] The story of the Victor Adding Machine begins—ironically enough—with a miscalculation. Or at least, a misunderstanding. Some might even go as far as to call it a bamboozling. In the summer of , according to lore, a salesman came to the. Aprivately owned undated brochure for the Comptometer Educator uses some of the same photographs as a training manual for Comptometer operators, hence the date assigned. For the training manual, see Location Currently not on view Object Name adding machine training device date made ca

Comptometer Reciprocal Table - to - K Bytes Comptometer Reciprocal Table - to - K Bytes Form Q Printed in U.S.A. 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. The instruction manual for the Felt Tarrant "Comptometer" was first produced in the s, and was progressively updated to cover the new features of subsequent models. This very comprehensive edition was produced in for the Model J Comptometer, but still contains sections of text from and illustrations from