The term double action was originally applied to revolvers. In the 19th century revolvers were often classified as to how their hammers were cocked. They were either "thumb-cocked", in which the hammer had to be cocked for each shot by the thumb, or "trigger-cocked", in which a long pull on the trigger first cocked the hammer and then released it to fall and fire the weapon.
Before the American Civil War most revolver designs were limited to one of these two ways of cocking the hammer. For example, the early Colt revolvers were "thumb-cocked" and early Webley revolvers were "trigger-cocked". As the development of revolver mechanisms progressed, new designs were created in which the hammer could be cocked either way, that is, the user could first cock the hammer with the thumb and then use the trigger to fire, or he could simply pull the trigger far enough so that the hammer was first drawn rearward and then released to fire. As time passed the terms "thumb-cocked" and "trigger-cocked" fell into disuse. Thumb-cocked actions came to be called "single actions", meaning actions in which the hammer always had to be cocked by the thumb for each shot. During the latter 19th century the "trigger-cocked" actions fell out of general favor and were steadily replaced by newer actions in which the hammer could be either thumb-cocked or trigger-cocked. This arrangement is now probably the most common for revolvers and is increasingly used for semiautomaticpistols. In the U.S., the original term for the newer type of hammer cocking arrangement was "double action" because the shooter now had a choice of two (double) methods of cocking the hammer.
Eventually this reason for the use of the term "double action" was generally forgotten and the term "double action" firing is now commonly used only to mean using a single motion of the trigger to both cock the hammer and fire in the "trigger-cocked" mode. Ironically, a few types of revolvers and pistols which can only be trigger-cocked (lacking a way to cock the hammer manually in the single action manner) are now usually (and misleadingly) termed "double action only" in spite of the fact that the term "double action" originally meant that the shooter had two choices of how to cock the hammer.
Electromagnetic pickups (single and double coil) convert the vibration of the steel strings into electric signals which are fed to an amplifier through a cable or radio device.
The lower fretboard action (the height of the strings from the fingerboard) and its electrical amplification lend the electric guitar to some techniques which are harder (or impossible) to execute on acoustic guitars.
The electric bass guitar is similar in tuning to the traditional double bass viol.
A theory of action is first a theory: ‘its most general properties are properties that all theories share, and the most general criteria that apply to it – such as generality, centrality and simplicity - are criteria applied to all theories’ (Argyris and Schön 1974: 4).
Their relation to action 'is like the relation of grammar-in-use to speech; they contain assumptions about self, others and environment - these assumptions constitute a microcosm of science in everyday life' (Argyris and Schön 1974: 30).
If our actions are driven by moving away from something then our actions are controlled and defined by whatever it is we are moving away from, not by us and what we would like to be moving towards.
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