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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 Fuller calculator, sometimes called Fuller's cylindrical slide rule, is a cylindrical slide rule with a helical main scale taking 50 turns around the cylinder. This creates an instrument of considerable precision – it is equivalent to a traditional slide rule 25.40 metres (1,000 inches) long. It was invented in 1878 by George Fuller ...
A modern scientific calculator with an LCD. An electronic calculator is typically a portable electronic device used to perform calculations, ranging from basic arithmetic to complex mathematics. The first solid-state electronic calculator was created in the early 1960s. Pocket-sized devices became available in the 1970s, especially after the ...
The 1/4-turn shaft carries (also, each column) gears with 12, 16, and 20 teeth, for 3, 4, and 5. Digits [1] and [2] are handled by 12 and 24-tooth gears on the 1/12-revolution shaft. Practical design places the 12th-rev. shaft more distant, so the 1/4-turn shaft carries freely-rotating 24 and 12-tooth idler gears.
Atlas Model Railroad Co. Atlas Model Railroad Company, Inc. makes scale models in N scale, HO scale, and O scale. The company is based in Hillside, New Jersey, United States. They produce a wide variety of locomotives, rolling stock, and vehicles. Atlas is well known for their flex track and codes 55, 80, 83 and 100 track.
Fairbanks, Morse and Company was an American manufacturing company in the late 19th and early 20th century. Founded in 1823 as a manufacturer of weighing scales, it later diversified into pumps, engines, windmills, coffee grinders, radios, farm tractors, feed mills, locomotives, and industrial supplies. It was purchased by the Penn-Texas ...
Ertl (formerly, the Ertl Company) is a former American manufacturing company and current brand of toys, best known for its die-cast metal alloy collectible replicas (or scale models) of agricultural machinery. Other products manufactured by Ertl include cars, airplanes, and commercial vehicles. The company was based in Dyersville, Iowa, home of ...
Bachmann sells model trains in HO scale, N scale (1:160 and 1:148), On30, 00 gauge, HOn30 (HO scale on N tracks) and G scale around the world, in addition to buildings and accessories: North America – Bachmann Industries HO scale, N scale (1:160), On30 and G scale. Plasticville O scale and S scale. Williams (O scale).