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Following the patent and release of Harold's Long Scale calculator featuring two knobs on the outside rim in 1914, he designed the Magnum Long Scale calculator in 1927. [ 6 ] [ 7 ] As the name "Magnum" implies, it was a fairly large device at 4.5 inches in diameter—about 1.5 inches more than Fowler's average non-Magnum-series calculators. [ 8 ]
The calculator was sold in a hinged mahogany case 46 by 12 by 11 centimetres (18.1 in × 4.7 in × 4.3 in) which, if required, holds the instrument when in use by means a brass support that can be latched to the outer end of the case. [6] [7] Out of its case the calculator weighs about 900 grams (32 oz). [8]
The EL-8 was much smaller, small enough to be used in one's hand: 164 mm (6.46 in) long, 102 mm (4.02 in) wide, and 70 mm (2.76 in) thick, and weighing 0.72 kg (1.59 lb) with batteries. [6] Although it was still too bulky to easily fit in a pocket, [ 1 ] it was an important step toward the development of the pocket calculator.
Used by Heller for model ships, and proposed by the Japanese to supersede 1:144 scale trains. Models which are commonly made in scale at 1:150 are commercial airliners - such as the Airbus A320, Boeing 777 all the way to the jumbo jets - the Airbus A380 & Boeing 747. [8] 1:148: 2.059 mm: Model railways (British N) British N model railroad scale ...
The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria.By 1938, he had filed a key patent, covering his complemented stepped drum. [3] [4] This single drum replaced the multiple drums, typically around 10 or so, of contemporary calculators, and it enabled not only addition, but subtraction through nines complement math, essentially subtracting by adding.
ANITA Mk VIII. The ANITA Mark VII and ANITA Mark VIII calculators were launched simultaneously in late 1961 as the world's first all-electronic desktop calculators. [1] [2] Designed and 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 their logic circuits and nixie tubes for their numerical ...
A large control knob on the upper right can be set to add, multiply, divide or subtract positions. [7] The Millionaire was first patented in Germany in 1892. Patents were issued in France, Switzerland, Canada and the United States in 1893, and production started in 1893. [8] From 1899 to 1935 Hans W. Egli of Zürich handled the machine. The ...
ZZ scale: 1:300: 4.8 mm Introduced by Bandai, ZZ scale was very briefly the smallest commercially available model railway available. As of 2005 only three Shinkansen trains are available and limited other items. The trains are battery-powered and run on plastic rail. Bandai makes no accessories for this scale. T scale: 1:450 1:480: 3 mm