The receiver hook is mounted directly under the bell as shown in Figure 94. The hook should project out to the left beyond the edge of the back. The hook is mounted by a round headed brass screw passing through the hole in the right hand end.
[Illustration: FIG. 97.—Circuit showing how to connect two Telephone
Stations to the Line.]
The hook should move freely up and down between two contacts (marked 1 and 2 in Figure 94). These contacts are simply two small brass strips bent at right angles and fastened about an inch apart along the left hand edge of the wooden back by means of two small round headed brass wood screws. The position of the contacts should be such that the hook is in a horizontal position when it is half way between the two. A small spring is arranged so as to pull the hook up against the upper contact (No. 1) when the receiver is lifted off. When the receiver is hung on the hook, it should overcome the lift of the spring and pull the hook down against the lower contact (No. 2).
*The Receiver* may be purchased at almost any reliable electrical supply house. It should be provided with a ring so that it can be hung onto the hook.
*The Transmitter* is preferably of the "solid back" long distance type. It also can be purchased ready made from almost any electrical supply house.
The transmitter is mounted on the wooden back directly under the hook.
It is marked T in Figure 94.
*A Push Button*, made out of two round headed brass wood screws and a strip of spring brass as shown in Figure 96, is mounted to the right of the transmitter.
One end of the spring is fastened down firmly with a screw, the other end is bent so that it is directly over but does not touch the second screw mounted about seven-eighths of an inch away.
Four binding posts should be arranged along the bottom of the wooden back and two more just to the left of the transmitter.
The set is now ready to "wire" or connect. The connections can be understood best by following the diagrams in Figures 94 and 97.