Brennan Adding Machine
date: label: date made
content: ca 1930
name: label: maker
content: Brennan Adding Machine Company
notes: label: Description
content: This adding machine has a black case, with a green metal plate under the keyboard. It has nine black plastic digit keys arranged in a square with a “0” bar below. The digits are in white, with smaller complementary digits in red. There are red SUB (/) TOTAL and TOTAL keys to the left of the digit keys and a smaller red key to the right. Numbers of up to nine digits may be entered. Depressing the total key and the key on the right and bringing the lever forward clears the machine. At the front is a red key marked "E” that serves as a column indicator. Moving this key to the right eliminates digits entered erroneously. The metal operating lever, with wooden handle, is on the right side. Behind the keyboard is a glass window that reveals a row of nine plastic wheels that show the total. Behind these is a narrow carriage with a rubber knobs that carries a paper tape.
label: Description
content: The Brennan was invented by Thomas Mehan and manufactured in Chicago in roughly the years from 1929 to1931. This was not a good time to be starting a business in the United States, and the Brennan Adding Machine Company soon folded. The rights to manufacture the machine were acquired by Remington Rand by 1932, and it soon began to manufacture a similar machine as its "grocer's special."
label: Description
content: The machine is marked on the right and left side, with a stencil of an airplane: THE (/) BRENNAN. It is stamped on the bottom with serial number 4305.
label: Description
content: The prior owner of the machine did not know where it was used.
label: Description
content: References:
label: Description
content: This machine resembles that shown in an advertisement in <I>Typewriter Topics</I>, vol. 74, March, 1930. p. 61. It has more function keys than shown in 1929 advertisements.
label: Description
content: E. Martin, <I>Die Rechenmaschinen und ihre Entwicklungsgeschichte</I>, (1925 edition with later supplement), p. 457.
label: Location
content: Currently not on view
place: label: place made
content: United States: Illinois, Chicago
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
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content: Adding Machines
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content: Science & Mathematics
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1999.0297.01
label: accession number
content: 1999.0297
label: catalog number
content: 1999.0297.01
objectType: label: Object Name
content: adding machine
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: plastic (overall material)
label: Physical Description
content: paper (overall material)
label: Physical Description
content: rubber (overall material)
label: Physical Description
content: wood (overall material)
label: Physical Description
content: glass (overall material)
label: Measurements
content: overall: 14 cm x 22.4 cm x 31.5 cm; 5 1/2 in x 8 13/16 in x 12 13/32 in