TIM Unitas Calculating Machine
date: label: date made
content: 1908
name: label: maker
content: Ludwig Spitz & Co.
notes: label: Description
content: By the early 20th century, Germans who had gained experience in the calculating machine industry were opening new companies of their own. In 1907 Ludwig Spitz, an attorney who had represented German calculating machine firms, founded Ludwig Spitz & Co. in Berlin. The company sold improved forms of the arithmometer, particularly using designs of the engineer Robert Rein. These machine sold as the “T.I.M.,” which the company said stood for “Time is Money.” A German firm's choice of an English motto associated with Benjamin Franklin is noteworthy. Spitz was particularly proud of the “Unitas” machine, which united two carriages in one, making it possible to compute both subtotals and grand totals.
label: Description
content: This relatively early example of the Unitas, made of brass and German silver, fits in a polished wooden case. It has eight levers for setting numbers, with windows behind the levers to show the number set up. Below these are the stepped drums, which are not complete cylinders, but only partial and hollow. They appear to be die–cast from a composite metal.
label: Description
content: Behind these is a carriage with a seven-digit revolution counting register and a 12-digit result register. Behind this is a second carriage with a second result register. Metal rods carry sliding decimal markers for each register. The two carriages are held together on the left by a mechanism that can detach the back carriage from the front one.
label: Description
content: Left of the digit levers is a lever for setting the machine to addition/multiplication or subtraction/division. When the lever and an adjacent smaller lever are both in the add position, both carriages show results of addition. When the lever is in the upper position and the adjacent lever is in the middle position, the first carriage shows addition and the back one subtraction. A crank for operating machine is at the right front. To the left is a small glass bottle for ink, held in its own compartment.
label: Description
content: In the lid of the case of the machine is a table for converting shillings and pence to decimal fractions of an English pound and another table of decimal equivalents. The case can be locked but the key is missing. The bottom of the machine is hinged at the front and may be lifted to sit on metal legs at the back.
label: Description
content: A mark on the left front of the machine reads: Ludwig Spitz & Co. (/) TIM (/) TIME IS MONEY (/) TRADE MARK. A mark in front of the setting levers reads: Rechenmaschinenfabrik LUDWIG SPITZ & Co., G. m. b. H., Berlin. A mark stamped on the right edge of the case reads: 0853. A mark stamped on the back edge of the case reads: 367. A mark on the front edge of the front carriage reads: 0724. A mark on the front edge of the back carriage reads: 0557.
label: Description
content: This machine comes from the collection of Felt & Tarrant Manufacturing Company of Chicago.
label: Description
content: From 1909 the Unitas was produced with a metal stand rather than the wooden case.
label: Description
content: References:
label: Description
content: E. Martin, <I>The Calculating Machines (die Rechenmaschinen)</I>, trans. P. A. Kidwell and M. R. Williams, Cambridge: MIT Press, 1992, pp. 194–196.
label: Description
content: <I>The Unitas</I>, New York: Oscar Muller & Co., 1908.
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 Victor Comptometer Corporation
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MA.323616
label: catalog number
content: 323616
label: accession number
content: 250163
objectType: label: Object Name
content: calculating machine
physicalDescription: label: Physical Description
content: metal (overall material)
label: Physical Description
content: brass (overall material)
label: Physical Description
content: paper (overall material)
label: Physical Description
content: glass (overall material)
label: Physical Description
content: plastic (overall material)
label: Measurements
content: overall: 14 cm x 44.8 cm x 25.5 cm; 5 1/2 in x 17 5/8 in x 10 1/32 in