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A folding sawhorse. Lightweight, stack-able, saw horses from the book Agricultural Woodworking: a group of problems for rural and graded schools ... by Louis Michael Roehl. 1916 In woodworking , a saw-horse or sawhorse (saw-buck, trestle, buck) [ 1 ] is a trestle structure used to support a board or plank for sawing .
Purcell Systems In October 2013, EnerSys acquired Purcell Systems a company based in Washington State. They are a leading designer, manufacturer, and marketer of thermally managed electronic equipment and battery cabinet enclosures for customers globally in telecommunication, broadband, utility, rail, and military applications. [7] UTS Holdings ...
In woodworking, a sawbuck is a structure for holding wood so that it may be cut into pieces. [1] Easily made in the field from rough material, it consists of an "X" form at each end which are joined by cross bars below the intersections of the X's.
NASA G2 flywheel. Flywheel energy storage (FES) works by accelerating a rotor to a very high speed and maintaining the energy in the system as rotational energy.When energy is extracted from the system, the flywheel's rotational speed is reduced as a consequence of the principle of conservation of energy; adding energy to the system correspondingly results in an increase in the speed of the ...
A scissors mechanism uses linked, folding supports in a criss-cross 'X' pattern. [1] The scissor mechanism is a mechanical linkage system used to create vertical motion or extension. It consists of a series of interconnected, folding supports that resemble the shape of a pair of scissors, hence its name.
The use of laying batteries increased gradually, becoming the dominant method somewhat before the integration of the egg industry in the 1960s. The practice of battery cages was criticized in Ruth Harrison's landmark book Animal Machines, published in 1964. [12] A simple battery cage system with no conveyors for feed or eggs
Pendulum clock driven by three weights as "gravity battery". An old and simple application is the pendulum clock driven by a weight, which at 1 kg and 1 m travel can store nearly 10 Newton-meter [Nm], Joule [J] or Watt-second [Ws], thus 1/3600 of a Watt-hour [Wh], while a typical Lithium-ion battery 18650 cell [2] can hold about 7 Wh, thus 2500 times more at 1/20 of the weight.
Powerchair design may be categorized by drive system/chassis, battery, controller, seat, and use. Because of their use as the primary method of locomotion , they must be of the utmost reliability both electrically and structurally, and are classified as Durable medical equipment by Medicare in the United States.
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