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A pinwheel calculator is a class of mechanical calculator described as early as 1685, and popular in the 19th and 20th century, calculating via wheels whose number of teeth were adjustable. These wheels, also called pinwheels, could be set by using a side lever which could expose anywhere from 0 to 9 teeth, and therefore when coupled to a ...
The Facit calculator, and one similar to it, are basically pinwheel machines, but the array of pinwheels moves sidewise, instead of the carriage. The pinwheels are biquinary; digits 1 through 4 cause the corresponding number of sliding pins to extend from the surface; digits 5 through 9 also extend a five-tooth sector as well as the same pins ...
Odhner thought of his machine in 1871 while repairing a Thomas' Arithmometer (which was the only mechanical calculator in production at the time) and decided to replace its heavy, bulky Leibniz cylinder by a lighter, smaller pinwheel disk. This is why the two machines share the same name but look completely different.
Read more The post 15 Iconic Cars From the 1970s That Screamed Success appeared first on Wealth Gang. The 1970s weren’t just about disco and bell-bottoms. It was a golden era for cars ...
Pages in category "1970s cars" The following 200 pages are in this category, out of approximately 559 total. This list may not reflect recent changes.
Chevrolet's car based on A platform Series M Copper-Cooled: 1923 1923 GM A: 1 Chevrolet's car based on Superior with air cooling system Series AA Capitol: 1927 1927 GM A: 1 Chevrolet's mid sized car that competed against the Ford Model A: Series AB National: 1928 1928 GM A: 1 Chevrolet's mid sized car that replaced Series AA Capitol Series AC ...
The 1970s weren't a decade for subtlety. Like the fashion and music of the era, cars were often bold, brash and unapologetically stylish, designed to command attention and dominate the road. This ...
The gift of a Texas Instruments calculator opened a new world of math problems and secret codes ... Vintage photos: ... Calculator was fun for a math phobic kid in the 1970s. Show comments.