Calculating MachinesPinwheel Calculating Machines
A second mechanism for entering numbers in a calculating machine was the pinwheel. As the name suggests, pinwheel machines had a series of wheels (initially mounted vertically) with nine retractable pins mounted around the edge. Setting a digit released a corresponding number of pins. Rotating the crank transferred the digits of the number to the mechanism of the machine. The pinwheel calculating machine was invented in the United States by Frank S. Baldwin and in Russia by the Swede W. T. Odhner. Odhner’s patents formed the basis of Swedish, German, French and later American calculating machines.
"Calculating Machines - Pinwheel Calculating Machines" showing 1 items.
- This is a twin Brunsviga calculating machine. The pinwheel lever-set non-printing machine has a metal housing painted black, a metal mechanism, a wooden base, and a metal cover. It consists of two adjacent and interconnected instruments. Each has ten levers for setting numbers, with the number set appearing in a row of windows above the levers. The two result registers are on a single carriage at the front of the machine, and the two revolution registers are in back of the respective levers. The handle for operating both machines extends from the right side. All the registers have zeroing levers and decimal markers.
- A mark on the right front carriage reads: BRUNSVIGA-MASCHINENWERKE (/) GRIMME, NATALIS & CO.A.-G. A stamp on the left front gives the model and serial number: BRUNSVIGA 13Z-18 (/) 200118
- The cover has three marks: H. T. 243; Hpk. 2; and PROPERTY OF USA -CE-M (/) 7420-111-0018.
- This machine came to the Smithsonian from the Department of Chemistry at Bridgewater College in 1972.
- Office Machines Research Service, vol. III, section 4.31, July, 1939, pp. 7–10.
- F. Schellstede, “Brunsviga. Produktionxzahlen, Absatzzahlen, Werbung. Versuch einer kurzen geschichtlichen Darstellung,” Kassel, 1990.
- Currently not on view
- date made
- ca 1950
- Brunsviga Maschinenwerke, Grimme, Natalis & Co.
- ID Number
- accession number
- catalog number
- maker number
- Data Source
- National Museum of American History, Kenneth E. Behring Center