
1) Ancient Greek technology 2) Chinese invention 3) Mechanical device 4) Mind control in fiction 5) Timepiece mechanism
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https://www.crosswordclues.com/clue/escapement

An escapement is a device in mechanical watches and clocks that transfers energy to the timekeeping element (the `impulse action`) and allows the number of its oscillations to be counted (the `locking action`). The impulse action transfers energy to the clock`s timekeeping element (usually a pendulum or balance wheel) to replace the energy lo...
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http://en.wikipedia.org/wiki/Escapement

the percentage of a spawning anadromous fish population that survives all obstacles during their migration, including fishing pressure and predation, and successfully reach their spawning grounds.
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http://en.wikipedia.org/wiki/Glossary_of_fishery_terms

• (n.) Way of escape; vent. • (n.) The act of escaping; escape. • (n.) The contrivance in a timepiece which connects the train of wheel work with the pendulum or balance, giving to the latter the impulse by which it is kept in vibration; -- so called because it allows a tooth to escape from a pallet at each vibration.Escapement: word...
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http://thinkexist.com/dictionary/meaning/escapement/

Part of the mechanism in a clock or watch that controls the driving force (either a weight or a spring) and allows it to 'escape' at regular intervals. This counteracts the tendencies of both an unchecked weight to accelerate and a spring to weaken on unwinding.
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http://www.antique-marks.com/antique-terms-e.html

in mechanics, a device that permits controlled motion, usually in steps. In a watch or clock, it is the mechanism that controls the transfer of ... [4 related articles]
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http://www.britannica.com/eb/a-z/e/43

The ‘metering unit` which, working in conjunction with the balance or other controller, breaks down the motive force of the mainspring into controlled and regular steps by alternately delivering impulse to the balance and locking the train.  Its main components are the escape-wheel and the pallets;
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http://www.encyclo.co.uk/local/20450

<zoology> That portion of an anadromous fish population that escapes the commercial and recreational fisheries and reaches the freshwater spawning grounds. ... (09 Oct 1997) ...
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http://www.encyclo.co.uk/local/20973

Part of the mechanism in a clock or watch that controls the driving force (either a weight or a spring) and allows it to 'escape' at regular intervals. This counteracts the tendencies of both an unchecked weight to accelerate and a spring to weaken on unwinding. See also brocot and remontoire. The verge escapement was introduced with the first mech …...
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http://www.encyclo.co.uk/visitor-contributions.php
Es·cape'ment noun [ Confer French
échappement . See
Escape .]
1. The act of escaping; escape. [ R.]
2. Way of escape; vent. [ R.] « An
escapement for youthful high spirits.»
G. Eliot. 3. The contrivance in a timepiece which connects...
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http://www.encyclo.co.uk/webster/E/65

In horology, an escapement is a device intervening between, and acted upon by both, the power and the time-measurer in a clock or watch, to convert a continuous rotary into an oscillating isochronous movement. The power through the escapement imparts to the pendulum or balance-wheel an impulse sufficient to overcome the friction of the latter and t...
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http://www.probertencyclopaedia.com/browse/GE.HTM

[
n] - mechanical device that regulates movement
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http://www.webdictionary.co.uk/definition.php?query=escapement
noun mechanical device that regulates movement
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https://www.encyclo.co.uk/local/20974

the portion of a watch or clock that measures beats and controls the speed of the going train. Cf. anchor escapement, deadbeat (def. 1), · a mechanism for regulating the motion of a typewriter carriage, consisting of pawls and a toothed wheel or rack. · a mechanism in a piano that causes a hammer to fall back into rest position immedia...
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https://www.infoplease.com/dictionary/escapement
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