Multo Addo Mod 3 Pinwheel Mechanical Calculator

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Verkäufer: nigel315 ✉️ (4.922) 100%, Artikelstandort: St Boswells, Melrose, Borders, GB, Versand nach: WORLDWIDE, Artikelnummer: 172261367418 Multo Addo Mod 3 Pinwheel Mechanical Calculator.

Multo Addo Mod 3 Pinwheel Mechanical Calculator In 1874, Willgodt Theophil Odhner from Karlstad, Sweden, designed his first arithmometer, or hand-cranked calculating machine. After Odhner's original patent had expired, various manufacturers started production of calculators following Odhner's successful design. One of them was the Multo, manufactured by a subsidiary company of Addo, which later was to merge with the Facit-Odhner concern. Multos were built between about 1949 and 1966, although the Multo name was used on some models of the Odhner as late as 1969.

The grey machines probably date from the 1950s.

The Multo range was designed specifically for single-handed operation, with all of the controls located on the right-hand side.

The Multo rotor has ten setting rings on 7mm centres, with a check dial above and a quick-clearing lever to the right. The carriage has only one clearing lever, which normally clears both registers. Pressing the adjacent tab disconnects the accumulator and clears only the counter (as in setting up a division). It is not possible to clear only the accumulator.

The carriage is spring-loaded to the left, and is moved stepwise in either direction by the lever under the winding handle. A button on the front of the machine releases the carriage and returns it fully to the left. There is no tens-carry on the counter, and no back-transfer mechanism.

The "pin-wheel" from which these calculators take their name is a circular disc or wheel which has nine retractable pins extending radially around part of its circumference. The pins can be extended or retracted by a setting mechanism, which is generally operated by rotary levers. The pin-wheels and setting rings are assembled into a "rotor" or cylinder, which rotates forward or backward as the handle is turned. The extended pins act as gear teeth to advance a register by the corresponding number of places.

Digits: 10 rotor, 8 counter, 13 accumulator  Dimensions: Body 30cms x 16cms x 13cms high. Weight: 5.9 kg  Heavy machine to post Manufactured: Malmo, Sweden, 1950s

This early machine carries the Multo Addo logo, a serial number 3-4278 but no indication of the manufacturer.

Full working order. Machine has been serviced. Very compact and robust look. Has a historic inventory K1 red paint mark.

  • Condition: Gebraucht
  • Condition: Full working order

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