The Washington herald., 1922-03-05

through the other insulator, G, to a
point where the two insulators are
separated by about seventy five
feet; twist the insuiator. G. SO as
to form an anchor. as shown IN
Figure 1. The remainder Of the an
tenna wire, J, which now constI-
tutes the "lead-in" or drop wire
should be just long enough to reaca
the lighting switch.
The Lightning Switch.
X is the lightning switch. For
the purpose Of a small antenna this
switch may be the ordinary porce-
lain base. 80 ampere, single-pole
double throw battery switch. These
switches. as ordinarily available.
have porcelain base about by 4
inches. The '1ead-in'' wire, J, is
attached to this switch at the mid
die point. The switch blade should
always be thrown to the lower clip
when the receiving set Is not ac-
tuaily being used and to the upper
clip when II Is desired to receive
signals.
L is the ground wire for the
lightning switch; It may be a piece
OF the same size wire as used in the
antenna, of sufficient length to
reach from the lower clip of the
lightning switch. X. to the clamp
on the ground rod, NJ.
NJ is piece Of iron pipe or rod
driven three to six feet into the
ground. preferably where theground
is moist, and extending a sufficient
distance above the ground in order
that the ground clamp may be 'fas-
tened to II. Scrape the rust or
paint from the pipe before driving
In the ground. .'-
N is a wire leading from the up
per clip of the lightning switch
through the porcelain tube, o. to
the receiving set binding post
marked "antenna"
o lis a porcelain tube of sufficient
length to reach through the win
dow casing or wall. This tube
should be mounted in the casing or
wall so that It slopes down toward
the outside of the building. This
Is done to keep the rain from fol-
lowing the tube through the wall
to the interior.
Receiving Set Parts.
r Is the receiving set which Is
described in detail below.
N is the wire leading from the
"antenna" binding post of the re-
ceiving set through the porcelain
tube to the upper clip of the light
ming switch. This wire, as well
as the wire shown by Q. should
be insulated and preferably flexible.
Q is a piece of flexible wire lead
ing from the receiving set binding
post marked ground" to a water
pipe. heating system or some other
metallic conductor to ground, ex-
cept NJ. Fig. l. If there are no
water pipes nor radiators lin the
room in which the receiving set is
located, the wire should be run out
ground" below the window. which
shall not be the same as the
ground" for the lightning switch,
1t is essential that for the best
operation of the receiving set this
ground" be of the very best type.
II the soil near the house is dry
it Is necessary to drive one or more
pipes or rods sufficiently deep to
encounter moist earth and connect
theJ ground wire to the pipes or
rods. This distance will ordinarily
not exceed six feet. Where clay
soil is encountered this distance
may be reduced to three feet, while
in sandy soil It may be Increased
to ten feet. II some other metallic
conductor, such as the casing of a
drilled well, is not far away from
the window. 1t will be satisfac-
tory ground"
Continued from Yesterday.
Readers are requested to save the
diagrams for reference in connec-
tion with succeeding installments
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