Prototype of the first all-electronic desktop calculator marketed by Sumlock Comptometer Ltd of the UK
The Comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887.
A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number simultaneously, using as many fingers as required, making them sometimes faster to use than electronic calculators. Consequently, in specialized applications, comptometers remained in use in limited numbers into the early 1990s, but with the exception of museum pieces, they have all now been superseded by electronic calculators and computers.
Manufactured without interruption from 1887 to the mid-1970s, it was constantly improved. The mechanical versions were made faster and more reliable, then a line of electro-mechanical models was added in the 1930s. It was the first mechanical calculator to receive an all-electronic calculator engine in 1961, with the ANITA Mark VII model released by Sumlock Comptometer. This created the link between the mechanical calculator industries and the electronic.
Although the comptometer was primarily an adding machine, it could also do subtractions, multiplication and division. Its keyboard consisted of eight or more columns of nine keys each. Special comptometers with varying key arrays were produced for a variety of special purposes, including calculating currency exchanges, times and Imperial weights. The name comptometer was formerly in wide use as a generic name for this class of calculating machine.
The Comptometer was the first commercially successful key-driven mechanical calculator, patented in the United States by Dorr Felt in 1887. A key-driven...
mechanical calculators from 1901. In 1961, a comptometer type machine, the Anita Mk VII from Sumlock comptometer Ltd., became the first desktop mechanical...
not gain widespread use until Dorr E. Felt started manufacturing his comptometer (1887) and Burroughs started the commercialization of differently conceived...
built by the Bell Punch Co. in Britain, and marketed through its Sumlock Comptometer division, they used vacuum tubes and cold-cathode switching tubes in...
larger facilities in Dyersville, Iowa 1967 - Ertl is acquired by Victor Comptometer Corporation 1971 - Ertl acquires Carter Tru-Scale 1973 - Ertl begins...
the only other competitor in true commercial production, had sold 100 comptometers. It wasn't until 1902 that the familiar push-button user interface was...
Williams and Woods, a Dublin confectionery factory, where she worked as a comptometer operator. Hurl attended the National College of Art and Design in 1975...
fiberglass and other modern materials. Fred Bear sold the company to Victor Comptometer in 1968, but remained the president of Bear Archery. The company was...
"smaller than a typewriter". The original prototype was built by Victor Comptometer using vacuum tubes in 1963. When this was successful, the company sought...
worked as a printer and his mother, Rosalie, worked as a homemaker and comptometer operator. In the 1920s, his grandparents, Maria and Angelo, immigrated...
calculator in the world, ten years later, by 1900, four machines, the comptometer and Burroughs' adding machine in the USA, Odhner's Arithmometer in Russia...
American inventor and industrialist who was known for having invented the Comptometer, an early computing device, and the Comptograph, the first printing adding...
to help support her family. She lost her first job (as a typist and comptometer operator) after taking her guitar to work and playing it during tea-breaks...
the Tesla Model 3 Honda e, an electric car by Honda Comptometer Model E, a version of the Comptometer mechanical calculator Vickers Model E machine gun...
Belgium. Oldham's Australian-born mother, Celia Oldham, was a nurse and comptometer operator. Oldham attended the Aylesbury School for Boys, Cokethorpe School...
the Comptometer Corporation, which produced calculating machines and a telecommunication device called the Electrowriter. In 1965 Victor Comptometer Corporation...
era coat buttons; a collection of Montie Montana memorabilia; a 1915 comptometer; and a 2005 Suzuki GSX-R 1300 Hayabusa motorcycle. Upset over dwindling...
early electronic desktop calculators, including the first: the Sumlock-Comptometer ANITA Mk VII of 1961 and even the first electronic telephone switchboards...
Victor Technology, known earlier as Victor Adding Machine Co. and Victor Comptometer, an American calculator company Victor (sports company), a Taiwanese...
23 custom integrated circuits for an electronic calculator for Victor Comptometer proved to be too ambitious given the reliability of PMOS circuits at...
designs were completed in Babbage's lifetime. The Arithmometer and the Comptometer are mechanical computers that are precursors to modern digital computers...
Buehler Library, named in honor of the former president of the Victor Comptometer Corporation and board of trustees member, is home to over 237,000 volumes...
Otherwise, pressing a 5..9 key would require either a longer stroke (as in a Comptometer) or excessive force combined with a gently sloping cam surface. – Curt...
Patricia Hurl's first job was in the office of Williams and Woods as a comptometer operator. The company was ultimately taken over by Nestlé after its UK...
such as the abacus, log tables, slide rule, stepped reckoner, or the comptometer, but the most commonly used device for everyday commerce was the ready...
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