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A partially disassembled Curta calculator, showing the digit slides and the stepped drum behind them Curta Type I calculator, top view Curta Type I calculator, bottom view. The Curta is a hand-held mechanical calculator designed by Curt Herzstark. [1] It is known for its extremely compact design: a small cylinder that fits in the palm of the hand.
Engineer using a slide rule, with mechanical calculator in background, mid 20th century A more modern form of slide rule was created in 1859 by French artillery lieutenant Amédée Mannheim , who was fortunate both in having his rule made by a firm of national reputation, and its adoption by the French Artillery.
Friden Calculator Friden Flexowriter. In 1957, Friden purchased the Commercial Controls Corporation of Rochester, New York.This gave them the Flexowriter teleprinter, an electric typewriter capable of being used as part of unit record equipment developed in World War II for the Department of the Navy to automatically type "regret to inform you" letters to the survivors of fallen servicemen ...
Electric motors were used on some mechanical calculators from 1901. [9] In 1961, a comptometer type machine, the Anita Mk VII from Sumlock comptometer Ltd., became the first desktop mechanical calculator to receive an all-electronic calculator engine, creating the link in between these two industries and marking the beginning of its decline ...
Room temperature, colloquially ... a 1978 UK study found average indoor home temperatures to be 15.8 °C (60.4 °F) while Japan in 1980 had median home temperatures ...
Reduce the temperature on your water heater or set it to vacation mode, which will keep the water just warm enough to protect your pipes. If you leave a light on, use a timer so it turns off ...
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 ...
Keeping the air inside your home healthy depends on knowing the reasons it turns bad in the first place.