A device used on a pipe organ to allow a player to play multiple divisions at once, by means of "coupling" a division to another at either sub, super, or octave pitches.
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Category: Disambiguation Knuckle (AAR Type E) couplers in use. ... The field of electronics is the study and use of systems that operate by controlling the flow of electrons (or other charge carriers) in devices such as thermionic valves and semiconductors. ... Acoustically coupled modem In telecommunications, the term acoustic coupler has the following meanings: An interface device for coupling electrical signals by acoustical means--usually into and out of a telephone instrument. ... BlackBerry 7100t Telecommunications is the communication of information over a distance. ... In telecommunications, a directional coupler is a transmission coupling device for separately sampling (through a known coupling loss) either the forward (incident) or the backward (reflected) wave in a transmission line. ... Lasers range in size from microscopic diode lasers (top) with numerous applications, to football field sized neodymium glass lasers (bottom) used for inertial confinement fusion, nuclear weapons research and other high energy density physics experiments. ... A mirror is a surface with good specular reflection that is smooth enough to form an image. ... A universal joint Spicer joint is a joint in a rigid rod that allows the rod to bend in any direction. ... An Oldham coupler is a method to transfer torque between two parallel but not-quite-collinear shafts. ... The organ of Bristol Cathedral, Bristol, England. ...
In 1893, satisfied that an automatic coupler could meet the demands of commercial railroad operations and, at the same time, be manipulated safely, the United States Congress passed the Safety Appliance Act.
In absolute numbers, coupler related accidents dropped from nearly 11,000 in 1892 to just over 2,000 in 1902, even though the number of railroad employees steadily increased during that decade.
A coupler is also a feature of organs, which will cause a key depressed on a keyboard to play another key on the same keyboard, play a key on a different keyboard, or sound a note in some division.
Since the modem could not dial the phone, the acoustic coupler remained common because you needed to dial the phone separately anyway.
Modems generally remained at 300 and 1200 bps into the mid-1980s, although over this period the acoustic coupler disappeared seemingly overnight as Smartmodem-compatible modems flooded into the market.
A 2400 bps system similar in concept to the 1200 bps Bell 212 signalling was introduced in the US, and a slightly different, and incompatible, one in Europe.
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