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 ten-key non-printing electric pinwheel calculating machine has an iron frame painted dark green. It has fully automatic addition, subtraction, multiplication, and division, as well as electric clearing of registers.
- A lever on the front left sets the machine for multiplication, addition (and subtraction), or division. There are five function keys and three tab keys. All the key tops are plastic. Plastic-covered windows reveal the number wheels of the product register, multiplier register, and setting mechanism. Included are a plastic cover, rubber cord, and leather-covered wood case.
- A mark on the bottom of the machine reads: 347409. A tag on the back reads: MOD.ESA-0 (/) Fi (/) 105-115V = 65W. Another tag on the back reads: MADE BY (/) ATVIDABERG-FACIT (/) SWEDEN (/) Protected by patents in Sweden and other countries. A mark on the front reads: FACIT. The digit keys are marked: 2 4 5 7 9 (/) 1 3 0 6 8. A name tag attached to the case reads: WILLIAM C. ZAHN.
- The Swedish firm of Facit Calculator began manufacturing pinwheel calculating machines in 1918 and became Facit in 1924. In 1932 it began to manufacture a ten-key calculating machine. The ESA-0 is an electric, fully automatic version of that machine, with electric clearing of registers. It sold from 1949 through 1952.
- According to the donor, this machine was used by her husband, William C. Zahn, in his wide-ranging research on organic chemistry, the senses, the weather, and economics.
- For related documentation, see 1996.0033.02, 1996.0033,03. and 1996.0033.04.
- FACIT Kalkylmaskiner - samitliga modeller, Stockholm, 1961.
- Currently not on view
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- National Museum of American History, Kenneth E. Behring Center