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1022 HANDBOOK OF PROJECTION FOR
movement of our hand so that it is out of time with the movement of the weight in any degree, we shall discover that we cannot alter the time of movement of the weight, unless we alter the weight of the weight or the size or elasticity of the rubber band. In other words that particular band and weight will only "bob" at one set speed and no other. Kindly do not ask me why that is so, for I don't know, nor to date has any one been able to tell me in language any ordinary human could possibly understand.
Note. — It's a bit wonderful what terms, language, etc., the engineers can summon to their aid to befuddle we poor humans when (we strongly suspect) they don't understand some matter any too well themselves.
If we substitute the hairspring of our watch for the rubber band and weight we shall have exactly the same thing in another form. That is why the watch keeps time. The hairspring of the watch represents the rubber band; the momentum of the wheel the weight and the mainspring of the watch, gravity and the movement of our hand. Try to get that balance wheel to perform at any other beat without changing something !
Similarly in resonant circuits and tuned circuits (essentially the same thing) and in oscillators, etcetera, condensers are employed as the electrically elastic members of the combination which forms the desired effect of setting up electrical vibration or oscillation at a certain rate or frequency.
VARIABLE CAPACITY.— In radio work, condensers are used which employ the medium of air for insulation between the plates, instead of paper, etc. Altering the relation of the plates of such condensers with relation to