Willgodt T. Odhner invented his very successful “pinwheel” four-function calculator mechanism in Russia in 1874, and his invention was cloned by numerous companies, resulting in dozens of similar models that remained in wide use for almost a century. Numbers are dialed into the sliding levers on the top part of the machine, and are added to the register visible in the carriage at the bottom when the large crank is turned. Shifting the carriage sideways allows multiplication through a sequence of addition operations; the two small cranks zero the registers. The design includes ingenious error-preventing interlocks between all the controls: should the operator fail to return a crank to its resting position, the other controls are frozen until this is corrected. A bell indicates calculations in the negative. Used in Ballarat Institute of Advanced Education (B.I.A.E) Physics department.Black, mechanical calculating machine. Metal. Hand-operated, with three hand-cranks. 10x10 rotor with 13 digit result. Ser. No. 29-286781.5 Black symotape on base front: "PHYSICS". Maker's identification on top surface. Supplier's label (metal, silver & blue) on back: "STOTT & HOARE Pty. Ltd. 171 William St. Melbourne C1 M1991". Stamped on rear panel: "MADE IN SWEDEN". Cast lettering on underside: "M-602 07".calculating machine, pinwheel, calculator, scientific instruments, stott & hoare pty ltd, physics, odhner, ballarat institute of advanced education

ODHNER/BRUNSVIGA TYPE MULTO model 13or 113 keys: 10 x 8 x 13 same as F288/M1

ODHNER/BRUNSVIGA TYPE keys: 10 x 8 x 13 [donated by Jack McDonell (6 Mar 1997) who salvaged it when being discarded from UniMelb Physics III Labs in the 1950s. same as 289/M13 Serial No 3-2381

A 'Brunsviga' adding Machine used to educate people who were blind or vision impaired in arithmetic during in the early 1900s. The firm Grimme, Natalis & Co (GNC) was established in 1871 to build sewing machines and domestic appliances at Braunschweig (Brunswick) in Germany. In 1892 engineer Franz Trinks was instrumental in securing the manufacturing rights to the Odhner calculator patents. The first machines were built according to W.T. Odhner's 1890 design, and were distributed under the brand name "Brunsviga". Trinks continued to develop and refine the Brunsviga calculator over a period of almost 30 years. The brass rotor disks are 71mm in diameter, with the nine setting levers spaced on 9mm centres. The moving carriage has 10 places in the counter register and 18 in the accumulator, but the tens-carry mechanism only covers 10 of the 18 places. The carriage is positioned manually by releasing a latch and moving the assembly by hand to the required position. The registers are cleared by a full turn of the large wing nuts on either end. The mechanism is very basic, with no safety interlocks and no added features.Metal machine on wooden base.Brunsviga Patent Braunschweigoffice equipment and supplies, royal victorian institute for the blind