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Two control knobs for a heating/cooling system. The left knob controls the temperature while the right controls the fan speed. A control knob is a rotary device used to provide manual input adjustments to a mechanical/electrical system when grasped and turned by a human operator, so that differing extent of knob rotation corresponds to different desired input.
A rotary switch consists of a spindle or "rotor" that has a contact arm or "spoke" which projects from its surface like a cam. It has an array of terminals, arranged in a circle around the rotor, each of which serves as a contact for the "spoke" through which any one of a number of different electrical circuits can be connected to the rotor.
Jog Dial (at center of image) by Sony Ericsson Edit controller for the analog professional video format U-Matic.With two jog dials for controlling one VCR as source and one as a recorder, c. 1980s A DJ controller for controlling a DJ mixing software (e.g., a vinyl emulation) together with digital music files stored on a computer, with two jog dials each having about the size of a compact disc
Rotary DIP switches contain multiple electrical contacts, one of which is selected by rotating the switch to align it with a number printed on the package. Some have a knob that can be turned by fingers, or a small slot that requires a screwdriver to change them.
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A right-hand railroad switch with point indicator pointing to right Animated diagram of a right-hand railroad switch. Rail track A divides into two: track B (the straight track) and track C (the diverging track); note that the green line represents direction of travel only, the black lines represent fixed portions of track, and the red lines depict the moving components.
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The Griffin PowerMate was officially supported on Mac OS X, Windows XP and Vista.Griffin's software for Windows works under Windows 7 and 8 but crashes occasionally; for macOS, there is no official support past 10.12 ("Sierra", released in 2016), though their USB version and configuration software (PowerMate Manager) continues to work on later versions.