For
an illustration, if a person standing on a bridge should drop a
pebble into the water below, after contact he would note circles
radiating out over the surface of the water. These circles, being
at right angles, 90 degrees, to the direction of the force that
caused the circles, are analogous to the flow of induction, and
hence the aerial line, being vertical, transmits signals
horizontally over the earth's surface.
** Beeswax for Wood Filler [85]
When filling nail holes in yellow pine use beeswax instead of
putty, as it matches the color well.
** How to Make a Lathe [86]
A small speed-lathe, suitable for turning wood or small metal
articles, may be easily made at very little expense. A lathe of
this kind is shown in the cut (Fig. 1), where A is the headstock,
B the bed and C the tailstock. I run my lathe by power, using an
electric motor and countershaft, but it could be run by foot power
if desired. A large cone pulley would then be required, but this
may be made in the same manner as the small one, which will be
described later.
[Illustration: Assembled Lathe Bed and Bearing Details]
The bed of the machine is made of wood as shown in Figs.
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