Indexing Mechanism for a Burroughs Class 7 Bookkeeping Machine

This model has a metal mechanism at the back and a wide carriage in front of this. In front of the carriage is a typewriter keyboard and space bar, and in front of these are two rows of white keys. The keys at the front include one set of digit keys and various function keys. The paper in the carriage has numbers printed sideways.
Toward the front of the machine, behind the typewriter keyboard, is a paper dial, under clear plastic, that has various phrases typed on it (e.g. “TOTAL CF”, “TRANSFER CF2-CF1”). Behind the carriage are three sets of rods on the top of the machine. To the right is a large cylinder mounted horizontally, with several toothed cylinders on it. The machine has no case. Mounted vertically at the back is a large thin disk with various holes in it. A small package of parts was received with the machine.
A red tag attached to the machine reads: PATENT DEPT. (/) #32. A metal tag attached to the bottom at the base reads: B.A.M.CO. (/) MODEL (/) [. . .]. A white tag attached to the machine reads: NOTICE (/) This machine to be preserved as a (/) model until at least 1958 for possible (/) use in any litigation or controversy which (/) may develop in connection with the feature (/) Sensing Controls (/) J. E. McVay (/) 7/25/38. Another white tag attached to the machine reads: U.S. PATENT OFFICE (/) MUELER (/) VS. CROSMAN (/) Intf. No. 72784 (/) MUELER EXH. No. 4 (/) B. Frank Whiberg (/) Notary Public.
Currently not on view
date made
ca 1935
Burroughs Adding Machine Company
place made
United States: Michigan, Detroit
Physical Description
plastic (overall material)
metal (overall material)
paper (overall material)
rubber (overall material)
overall: 35 cm x 72.5 cm x 64 cm; 13 25/32 in x 28 17/32 in x 25 3/16 in
ID Number
catalog number
accession number
Credit Line
Gift of Burroughs Corporation
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Bookkeeping Machines
Data Source
National Museum of American History, Kenneth E. Behring Center


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