Emory Ensign
Ensign Electric Calculating Machine is a highly developed, electrically driven adding and subtracting machine, particularly suited for multiplication (by repeated addition) and semi-automatic division (subtraction and division are done by complementary addition). It was devised and patented by the young engineer from Illinois Emory Seymour Ensign (1878-1944), in the beginning..Read More
Christel Hamann
The German engineer Christel Hamann (1870-1948) is an outstanding figure in the world of mechanical calculators. He is a holder of numerous patents (in USA, Canada, Germany, Sweden, Switzerland, and Great Britain) in this area and the constructor of countless mechanisms and calculators, let’s mention only Gauss, Berolina, Mercedes Euklid,..Read More
Adix of Josef Pallweber and Adolf Bordt
On 1 October 1903, the company Adix Company Pallweber & Bordt of Mannheim, Germany, was entered into the commercial register, for production of calculating machines. The sole shareholders were Josef Pallweber (1858-1921), a famous Austrian/German engineer, equipment manufacturer and inventor, and Adolf Bordt (1875-1940), an owner of a business for..Read More
Abraham Gancher
The Golden Gem adding machine enjoyed a long sales success through the first half of the 20th century. It was based on the Arithmachine of Heinrich Goldmann (a.k.a as Henry Goldman) from late 1890s, and on the efforts of three inventors—Abraham Gancher (a Russian Jew and emigrant to USA), Nobyoshi..Read More
William Cordingley
In the beginning of 20th century, the Englishman William George Cordingley, a merchant and author of several books for commerce, stock exchange, and business tables and calculations from the end of 19th and beginning of 20th centuries, devised a simple adding machine, which he patented in 1907 (British patent №190715435..Read More
Roberto Piscicelli
The Italian civil engineer from Naples Count Roberto Piscicelli (1863-1926) was a prolific inventor with 34 patents to his name, which he received in Italy, Great Britain, Denmark, France, Austria, Germany, Spain, Switzerland, and USA in the beginning of 20th century for railway-ticketing machines (machine for printing and issuing railway-tickets,..Read More
James Bassett
In 1909 the young inventor James Hunter Bassett (1888–1932) from Chicago, Illinois, started the production of adding device, quite similar in construction to the earlier Ribbon Adder of Charles Webb. In contrast with Ribbon Adder however, the device of Bassett (called Bassett Adder) had much better market success (at the..Read More
Reynold Johnson
Reynold B. Johnson (1906–1998) was a remarkable American inventor, one of the IBM company’s most prolific inventors, specializing in electromechanical devices. He was an owner of more than 90 patents, and is said to be the “father” of the hard disk drive, automatic test scoring equipment, microphonograph technology, a type..Read More