Account-o-Graph Calculating Machine
date: label: date made
content: ca 1913
notes: label: Description
content: This lever-set, manual non-printing proportional rod calculating machine has a black steel frame and a steel base. Nine levers move forward to set numbers, with a row of windows in front of the levers showing the number set. Right of the levers is the operating crank.
label: Description
content: In front is a carriage that moves when a release button is pushed. It has eight numeral wheels to record revolutions of the crank, and 16 numeral wheels to record results. These wheels are covered with glass. Numbers also may be set in the result register by rotating thumbscrews in the front of the carriage. This is done to set a dividend. Below the thumbscrews is a lever for zeroing the result register. There is a space for another zeroing bar or lever, but it has broken off.
label: Description
content: To the left of the setting levers and what may be a second carriage release button are two levers. One may be set at N or C. When it is set at N, the number in the revolution register increases by one whenever the crank is rotated. When it is at C, one rotation leads to subtraction in the revolution register. The other lever may be set at ADD.MULT or SUBT.DIV., depending on the arithmetic operation desired.
label: Description
content: A brass tag screwed to the top of the machine reads: THE-ACCOUNT-O-GRAPH (/) MONTREAL. It also reads: MODEL M. A mark on carriage on the left reads: MADE IN GERMANY. A mark on the middle of the back of the machine reads: 2438.
label: Description
content: This machine closely resembles the Mercedes-Euklid Model 1. It is from the collection of L. Leland Locke.
label: Description
content: Compare MA.330821.
label: Description
content: An application for a design trademark for a calculating machine called The Account-o-Graph was filed in the United States September 2, 1913, and granted shortly thereafter. The application stated that the term had been used in commerce since May of that year hence the date of the object.
label: Description
content: References:
label: Description
content: C. Hamann, "Calculating Machine," U.S. Patent 1,011,617, December 12, 1911. This patent was assigned to the Mercedes Bureau-Maschinen Gesellschaft of Berlin.
label: Description
content: <I>Official Gazette of the United States Patent Office</I>, vol. 195, #2, October 14, 1913, p. 531.
label: Location
content: Currently not on view
place: label: place made
content: Germany: Berlin, Berlin
topic: label: Subject
content: Mathematics
setName: label: See more items in
content: Medicine and Science: Mathematics
label: See more items in
content: Calculating Machines
label: See more items in
content: Science & Mathematics
creditLine: label: Credit Line
content: Gift of L. Leland Locke
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.311950
label: catalog number
content: 311950
label: accession number
content: 155183
objectType: label: Object Name
content: calculating machine
physicalDescription: label: Physical Description
content: rubber (overall material)
label: Physical Description
content: glass (overall material)
label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 18 cm x 38 cm x 28.1 cm; 7 3/32 in x 14 31/32 in x 11 1/16 in