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air register
Science; General science
A device attached to an air-distributing duct for the purpose of discharging air into the space to be heated or cooled. These openings are referred to as registers, diffusers, ...
amplifier
Science; General science
A device capable of increasing the magnitude of a physical quantity. This article discusses electronic amplifiers whose operation depends on transistors. Some amplifiers are ...
fire detector
Science; General science
A device designed to initiate a desired action in response to a change in its surroundings caused by an unwanted fire. Heat detectors respond when the surrounding temperature ...
respirator
Science; General science
A device designed to protect the wearer from noxious gases, vapors, and aerosols or to supply oxygen or doses of medication to the wearer. Respirators are used widely in industry ...
betatron
Science; General science
A device for accelerating charged particles in an orbit by means of the electric field E from a slowly changing magnetic flux Φ. The electric field is given by E = −(½π r ...
direct-coupled amplifier
Science; General science
A device for amplifying signals with direct-current components. There are many different situations where it is necessary to amplify signals having a frequency spectrum which ...
torque converter
Science; General science
A device for changing the torque-speed ratio or mechanical advantage between an input shaft and an output shaft. A pair of gears is a mechanical torque converter. A hydraulic ...
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