Computer Timeline – Page 25 – Yet another site for bright people, crafted by Georgi Dalakov

08 Dec 1891

Samuel Huizer

The Dutch engineer Samuel Leendert Huizer (1842-1899) had quite a few patents from the 1890s for various machines, between them several patens for a keyboard-operated adding machine: Germany (pat. №67678, 9 Mar 1892, and №70750, 31 Jan 1893), Belgium (No. 97493, 8 Dec 1891), France (No. 222997, 15 Jul 1892),..Read More

25 Dec 1891

Heinrich Proskauer

One of the first adding machines with full keyboard construction in Germany and Europe was created around 1890 by the engineer Heinrich Proskauer in Berlin. Later the construction of Proskauer was implemented in Sumlock Duolectric 912/C adding machine, which had a supporting electric drive. Heinrich Proskauer received two German patents..Read More

06 Sep 1892

Peter Landin

Peter J. Landin (1858-1940), a Sweden-born American inventor and businessman, commenced his work on calculating machines in the late 1880s, then living in Minneapolis, Minnesota. In September 1890 Landin applied for his first patent in this area, US patent No. 482014 for Cash Indicator, Register and Recorder. In February 1891..Read More

10 Dec 1892

Heinrich Esser

In the early 1890s, the German civil engineer Heinrich Esser (1845–1906), who lived in Aachen, where he worked as a municipal police building inspector, invented as a hobby and in his spare time the mechanical calculating machine, which he later patented in Germany (patent №82965, 10 December 1892), and USA..Read More

23 Dec 1892

Otto Steiger and Hans Egli

In December 1892 the brilliant Swiss engineer Otto Steiger from St. Gallen (1858-1923), who lived in Munich, received his first patent for a calculating machine of direct multiplication type (German patent DE 72870). Next years the machine was patented in Switzerland (No. CH6787), Great Britain (No. GB20968), France (FR228628), USA..Read More

05 Feb 1893

Josef Uržidil

On 5 February 1893, Josef Uržidil (1854-1922), a railway engineer from Žižkov, a small town in the vicinity of Prague, Austro-Hungarian Empire, received a German patent Nr. 70752 (see DE70752) for Additionsmaschine. The adding machine of Uržidil was a key-operated device with a calculating disc. Besides the granted patent, nothing..Read More

29 Mar 1893

Knut Wiberg

It seems almost at the same time as Peter Landin (around 1890), his compatriot Knut Edward Wiberg from Stockholm invented a very similar adding machine. However, in contrast with Landin’s device, Wiberg’s adding apparatus remained only on paper and besides the patent applications, nothing is known about it. n the..Read More

06 Apr 1893

Leonardo Torres

In 1893 the eminent Spanish engineer and inventor Leonardo Torres y Quevedo (1852-1936) presented his first paper to the Spanish Royal Academy of Sciences. It was devoted to an algebraic machine, able to calculate the roots of an any-grade equation. The paper was accompanied by a working prototype of the..Read More

31 Oct 1893

William Gubelmann

William Samuel Gubelmann (1865-1959) was a remarkable American inventor and businessman, who held hundreds of USA and Canadian patents, mainly in the field of adding machines, accounting machines, and cash registers. In 1959 Popular Mechanics magazine called Gubelmann the father of all calculating machines in use today. The New York..Read More

23 Jan 1894

Burridge and Marshman

Lee Spear Burridge (1861-1915) and Newman Russell Marshman (1846-1930) of New York were American inventive geniuses and manufacturers, who worked together between 1882 and 1897, and are primarily known as typewriter inventors, but they patented also quite a few calculating devices. t the beginning of the 1890s Burridge and Marshman..Read More