Brunsviga Midget (Brunsviga Model M) Calculating Machine

Brunsviga Midget (Brunsviga Model M) Calculating Machine

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This compact pinwheel lever-set manually operated non-printing calculating machine has a a steel mechanism and housing partly painted black. It has nine slots with levers for setting numbers. The levers rotate forward to set digits. A steel crank with a wooden handle that extends from the right side of the machine rotates backward (clockwise) for addition and multiplication and forward (counterclockwise) for subtraction and division. A wing nut on the left side zeros the setting levers.
At the front of the machine is a movable carriage with 13 windows that show dials of the result register on the right and eight windows for the revolution register on the left. The revolution register has no carry. Digits in this register are white for addition and red for subtraction. The sliding decimal markers are on a rod over the result and revolution registers.
Depressing a lever at the front of the machine releases the carriage for shifting. Rotating the wing nuts at the ends of the carriage zeros the registers on it. A bell is on the left end of the carriage.
Marks on the front of the machine read: BRUNSVIGA-MIDGET; No 25209; and PATENT (/) G.N.& C.C.a.A. A mark on the back of the machine at the bottom reads: Patented in the United States 12 June 1906.
The wooden case has a flat base and curved lid, with a handle, a lock, and a key on the right side.
Compare MA.309542.
Currently not on view
Object Name
calculating machine
date made
Grimme, Natalis & Co.
place made
Germany: Lower Saxony, Brunswick
Physical Description
steel (overall material)
wood (overall material)
overall: 12.5 cm x 31.5 cm x 15.2 cm; 4 29/32 in x 12 13/32 in x 5 31/32 in
ID Number
catalog number
accession number
maker number
Credit Line
Gift of Oscar W. Richards
See more items in
Medicine and Science: Mathematics
Science & Mathematics
Calculating Machines
Data Source
National Museum of American History
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