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What (who) is double acting - definition
TRIGGER MECHANISM WHICH IS COCKED AS PART OF THE TRIGGER MOVEMENT
Double-action; Double Action; Double acting; Double action (disambiguation); Double Action Kellerman
Double action
Double action (or double-action) refers to one of two systems in firearms where the trigger both cocks and releases the hammer.
Single- and double-acting cylinders
.jpg?width=200 "Typical horizontal steam engine with double-acting cylinder")
![Körting]] double-acting gas engine](https://commons.wikimedia.org/wiki/Special:FilePath/Körting gas engine (Rankin Kennedy, Electrical Installations, Vol III, 1903).jpg?width=200 "Körting]] double-acting gas engine")
![Körting]] gas engine, section](https://commons.wikimedia.org/wiki/Special:FilePath/Körting gas engine cylinder, section (Rankin Kennedy, Electrical Installations, Vol III, 1903).jpg?width=200 "Körting]] gas engine, section")
![Westinghouse single-acting [[high-speed steam engine]]](https://commons.wikimedia.org/wiki/Special:FilePath/Westinghouse high-speed single-acting compound engine (Rankin Kennedy, Electrical Installations, Vol III, 1903).jpg?width=200 "Westinghouse single-acting [[high-speed steam engine]]")
CLASSIFICATION OF RECIPROCATING ENGINE CYLINDERS
Double-acting cylinder; Single-acting cylinder; Single Acting Cylinder; Single acting cylinder; Double acting cylinder; Double-action piston engine; Single-acting piston; Double-acting piston; Single- and Double-acting cylinder
In mechanical engineering, the cylinders of reciprocating engines are often classified by whether they are single- or double-acting, depending on how the working fluid acts on the piston.
Acting rank
LOWER-RANKING OFFICER IS CALLED UPON TO REPLACE A SENIOR OFFICER, OR FILL A POSITION HIGHER THAN THE CURRENT RANK HELD
Acting (rank)
An acting rank is a designation that allows a soldier to assume a military rank—usually higher and usually temporary. They may assume that rank either with or without the pay and allowances appropriate to that grade, depending on the nature of the acting promotion.
Wikipedia
Double action
Double action (or double-action) refers to one of two systems in firearms where the trigger both cocks and releases the hammer.
- Double-action only (DAO) firearms trigger: The trigger both cocks and releases the hammer. There is no single-action function and the hammer will return to its decocked position after each shot.
- Double Action Kellerman (DAK): A variant of traditional double-action used on certain SIG Sauer semi-automatic pistols. DAK triggers have a long stroke with 29 N (6.5 lbf) pull. However, if a user shooting under stress short-strokes the trigger by only releasing it halfway, the trigger will reset, but with a 38 N (8.5 lbf) pull. This temporary increased trigger pull is intended to prevent negligent discharges.
- Traditional double-action – or double-action/single-action (DA/SA) – firearms trigger: The trigger combines the features of both a double-action only and a single-action only trigger.
- With a revolver using this action, the hammer can be cocked first (single action), or the trigger can be pulled and it will cock and release the hammer (double action). Once the gun has fired, the hammer stays in the decocked position until the hammer is re-cocked (single action), or the trigger is pulled again (double action).
- With a semi-automatic pistol using this action, the initial trigger pull will cock and release the hammer (double action). The blowback from the firing mechanism automatically re-cocks the hammer after the gun is fired, such that each subsequent shot only requires the hammer to be released (single action). A decocker, if present on the pistol, can be used to return the hammer to its decocked position to prevent negligent discharges.
