es about one
ampere. If additional bulbs are used to obtain louder sounds, each
such bulb also draws one ampere from the storage battery. The standard
audion-bulb receiving set does not use more than three bulbs, and
hence the maximum current drawn from the battery does not exceed three
amperes.

The automobile battery manufacturers have built special radio
batteries which have thick plates and thick separators to give longer
life. The thick plates are much stronger and more durable than the
thin plates used in starting and lighting work, but do not have the
heavy current capacity that the starting and lighting battery plates
have. A high current capacity is, of course, not necessary for radio
work, and hence thick plates are used.

Batteries used for radio work do not operate under the severe
conditions which exist on automobiles, and trouble is much less likely
to develop. However, the owner of the radio set rarely has any means
of keeping his battery charged, and his battery gradually discharges
and must then be recharged. It is in the sale of batteries for radio
work and in the recharging of them that the battery man can "cash-in"
on the radio phone "craze."

This business rightfully belongs to the automobile battery man and he
should go after it as hard as he can. A little advertising by the
service station man, stating that he sells radio batteries, and also
recharges them should bring in: very profitable business. The battery
man who calls for and delivers the radio batteries which need
recharging and leaves rental batteries in their place so that there is
no interruption in the reception of the evening concerts is the one
who will get the business.

As already stated, radio storage batteries have thick plates and thick
separators. Perforated rubber sheets are also used in addition to the
separators. Large sediment spaces are also generally provided to allow
a considerable amount of sediment to accumulate without causing
short-circuits. The cases are made of wood or hard rubber. Since radio
batteries are used in homes and are, therefore, used with handsomely
finished cabinets containing the radio apparatus, the manufacturers
give the cases of some of their radio batteries a pleasing varnished
or mahogany finish. Before returning radio batteries which have been
recharged, the entire batteries should be cleaned and the cases
polished. Returning radio batteries in a dirty condition, when they
were received cle