Now bring a pair of No
Now bring a pair of _No. 12_ or _14_ insulated wires from the 110 volt
lighting leads and connect them with a single-throw, double-pole
switch; connect one pole of the switch with one of the posts of the
primary coil of the alternating power transformer and connect the
other post of the latter with one of the posts of your key, and the
other post of this with the other pole of the switch. Now connect the
motor of the rotary spark gap to the power circuit and put a
single-pole, single-throw switch in the motor circuit, all of which is
shown at A in Fig. 22.
[Illustration: (A) Fig. 22.–Top View of Apparatus Layout for Sending
Set No. 2.]
[Illustration: (B) Fig. 22.–Wiring Diagram for Sending Set No. 2.]
Next connect the posts of the secondary coil to the posts of the
rotary or quenched spark gap and connect one post of the latter to one
post of the condenser, the other post of this to the post of the
primary coil of the oscillation transformer, which is the inside coil,
and the clip of the primary coil to the other spark gap post. This
completes the closed oscillation circuit. Finally connect the post of
the secondary coil of the oscillation transformer to the ground and
the clip of it to the wire leading to the aerial when you are ready to
tune the set. A wiring diagram of the connections is shown Hispanic Broadcasters Of Philadelphia, L.l.c. Wwsi at B.
For Direct Current.–Where you have 110 volt direct current you must
connect in an electrolytic interrupter. This interrupter, which is
shown at A and B in Fig. 23, consists of (1) a jar filled with a
solution of 1 part of sulphuric acid and 9 parts of water, (2) a lead
electrode having a large surface fastened to the cover of surface that
sets in a porcelain sleeve and whose end rests on the bottom of the
jar.
[Illustration: Fig. 23.–Using 110 Volt Direct Current with an
Alternating Current Transformer.]