ed to within about one inch of the top with weak electrolyte. The
jar is immersed to within about an inch of its top in the box. The top
part of the jar must be perfectly dry when the test is made, or else
the current will go through any electrolyte which may be wetting the
walls of the jar. A lead strip or rod, which is connected to the other
side of the 110 or 220 volt line, through a lamp as shown, is inserted
in the jar. If there is, a leak in the jar, the lamp will burn, and
the jar must be discarded. If the lamp does not light, the jar does
not leak.

Instead of using a lead lined box, a stone or earthenware jar may be
used. A sheet of lead should be placed in this jar, being bent into a
circular shape to fit the inside of the jar, and connected to one side
of the line. The lead rod or sheet which is inserted in the jar may be
mounted on a handle for convenience in making the test. The details of
the testing outfit may, of course, be varied according to what
material is available for use. The lamps should be suitably mounted on
the wall above the tester.

[Fig. 221 Testing jar for leaks, using a voltmeter in series
with test circuit]

This test may be made by using a voltmeter instead of lamps, as shown
in Fig. 221. If a voltmeter is used, be especially careful to have the
part projecting above the liquid perfectly dry. A leaky cell will be
indicated by a reading on the meter equal to the line voltage.

[Fig. 222 Testing jar for leaks, using secondary of Ford ignition
coil, or any other vibrator ignition coil]

A third method uses a Ford ignition coil, as shown in Fig. 222. A leak
will be indicated by a spark, or by the vibrator making more noise
than it ordinarily does. Instead of using the Ford coil, as shown in
Fig. 222, the test may be made as shown in Fig. 223. Fill the jar to
within an inch of the top with electrolyte and immerse one of the high
tension wires in the electrolyte. Attach the other high tension wire
to a wire brush, comb, or rod having a wooden handle and rub it over
the outside of the jar. A leak is shown by a spark jumping to the jar.

[Fig. 223 Testing jar for leaks, using secondary of Ford ignition
coil, or any other vibrator ignition coil]

The test may also be made without removing the jar. If the lead lined
box be made two feet long, the entire battery may be set in the box so
that the electrolyte in the box comes within an inch of the top of the
battery case. Fill