Burroughs Portable Adding Machine, Class 9  
Written by Accutron on 2017-03-22  

Introduced in the mid-1920s, the Burroughs Portable Adding Machine was intended to replace the earlier Class 1 adding machine. The Portable was designed by Alan A. Horton, who had previously designed the Burroughs Calculator, a direct competitor to the popular Felt & Tarrant Comptometer. The Portable has a modular internal construction, allowing for a wide range of feature variations. Portable models were available in Class 8 (addition only), Class 9 (addition/subtraction) and Class 10 (bank teller and receipt functions), with six, eight or ten columns, decimal or non-decimal systems, and motorized or hand-cranked variants. The example pictured here is an eight-column motorized Class 9 variant.

Burroughs Portable Adding Machine, Class 9, motorized variant.

This article is part of the [Mechanical Calculators] exhibit.

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