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by its energy produced again both heat and light.
We know, in a general way, the use of each device involved in this system of electric lighting; it may, however, be interesting to know something more definite as to the form and arrangement of
Fig. 20.
the several parts of these devices as well as the purpose they serve.
The most simple of these devices is what is termed a "Cut-out" or "Safety-catch." This is made in a great variety of forms according to the position in which it is to be used and the quantity of current it is to carry. That shown at Fig. 20 is intended to be attached to, and connect the metal portions of a feeder or other switch for carrying heavy
