Tim III Calculating Machine

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This rugged manually operated and non-printing stepped drum calculating machine has a brass and iron case painted black. The eight data entry levers are linked to both number dials and brass stepped drums. The number dials record digits entered. Levers in front of the dials zero the entry. An addition & multiplication / subtraction & division lever is on the left, and an operating crank is on the right. The plate at the front is easily removed to show the levers and a bell.
In back of the levers is the carriage, with nine revolution register dials and 16 result register dials. The zeroing bars for these registers are on the right of the carriage. A knob for lifting the carriage is on its far left. The entry levers, the revolution register, and the result register have sliding decimal markers. A bell rings to indicate overdivision. The entire machine has a steel cover painted black.
The machine is stamped on the front: Ludwig Spitz & Co. (/) TIM (/) TIME IS MONEY (/) TRADE MARK, and: THE OSKAR MULLER Co., New-York. A mark on the right side of the machine under the carriage reads: 05187. A mark on the left side, also under the carriage, reads: 3684. Left of the setting levers, the machine is marked: BREVET. A metal disc attached to the front cover reads: OSCAR MÜLLER & Co. (/) Sole Agents (/) for (/) U.S. & Canada (/) NEW YORK.
This object was a gift of the Brooklyn, New York, engineer Harold G. Wening.
Currently not on view
date made
ca 1912
Ludwig Spitz & Co.
place made
Deutschland: Berlin, Berlin
Physical Description
steel (overall material)
brass (overall material)
german silver (overall material)
rubber (overall material)
iron (overall material)
overall: 19.5 cm x 56 cm x 16 cm; 7 11/16 in x 22 1/16 in x 6 5/16 in
ID Number
catalog number
accession number
maker number
05187; 3684
Credit Line
Gift of Harold G. Wenig, P.E.
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Calculating Machines
Data Source
National Museum of American History


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