Historical information

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.

Physical description

Metal machine on wooden base.

Inscriptions & markings

Brunsviga Patent Braunschweig