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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 ...
In a medicine that is administered periodically, the trough level should be measured just before the administration of the next dose in order to avoid overdosing. [3] A trough level is contrasted with a "peak level" (C max), which is the highest level of the medicine in the body, and the "average level", which is the mean level over time. It is ...
This is a list of calculators produced by Clive Sinclair's company Sinclair Radionics: . Sinclair Cambridge. Sinclair Cambridge Scientific; Sinclair Cambridge Memory; Sinclair Cambridge Memory %
Marchant XLA calculator, based on Friden's design. The Marchant Calculating Machine Company was founded in 1911 by Rodney and Alfred Marchant in Oakland, California. The company built mechanical, and then electromechanical calculators which had a reputation for reliability. First models were similar to the Odhner arithmometer.
The scoop needed to be lowered at speed at the correct location – shortly before the start of the trough – and raised again when either the tank is full, or at the end of the trough. Failure to raise the scoop promptly when the tanks are full would resulted in large volumes of water being expelled from the vents, soaking the tender and ...
For forty years the arithmometer was the only type of mechanical calculator available for sale until the industrial production of the more successful Odhner Arithmometer in 1890. [8] The comptometer, introduced in 1887, was the first machine to use a keyboard that consisted of columns of nine keys (from 1 to 9) for each digit.
A parabolic trough collector (PTC) is a type of solar thermal collector that is straight in one dimension and curved as a parabola in the other two, lined with a polished metal mirror. The sunlight which enters the mirror parallel to its plane of symmetry is focused along the focal line , where objects are positioned that are intended to be heated.
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.