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1018 HANDBOOK OF PROJECTION FOR
tions. The leaf spring under other conditions. There is the compression, the pneumatic, the tension spring, etc. Each have their purpose in mechanics.
The same thing is true in condenser as applies to electrics. There are various types of condenser, each suited to a particular class of service. As a matter of fact each of the many purposes for which electrical condensers are used may be closely compared with some well known application of elasticity in the mechanical engineering field. As a matter of fact were electrical action visible to the eye, it would be found that the action of the condenser is just as simple and obvious as is the action of the spring, or of a rubber band when stretched and released.
We can observe the action of a rubber band or a spring. We therefore can instantly understand them and their action. The action of the condenser is invisible to the eye, hence is not so readily understood.
A SIMPLE EXPERIMENT.— A very simple experiment will serve to illustrate the matter perfectly. The rubber band I have spoken of has the two fundamental requirements of elasticity, namely: First, when we apply force in opposite directions to its ends, it stretches and if we measure the amount of stretch in inches and the power applied, we will discover that the power necessary to produce any given amount of stretch would be in exact proportion to the amount or length of the stretch ■ — that is to say, within the limits of elasticity of the rubber itself. Secondly, when the pull is released, the band instantly returns to its original length.
These two properties are found in all truly elastic substances or bodies. Electrical condensers have, as will be shown, precisely analogous properties.