, for
some time very satisfactorily. More than one lamp can be run by
connecting the bulbs in parallel, as indicated by Fig. 1, which
shows the special battery with 3 dry cells in the case, and the 2
binding posts for connection with the bulbs. In this case it is
also advisable to connect several batteries in parallel also, so
as to increase the current, but maintain the voltage constant.
Thus the individual cells are in multiple series, i. e., multiples
of series of three. By keeping in mind the ampere output of the
battery and rating of the lamp, one can regulate the batteries as
required. It must be remembered, in this connection, that any
battery which is drawn upon for half of its output will last
approximately three times as long, as if drawn upon for its total
output. Thus, in any system of lamps, it is economical to provide
twice as many batteries as necessary. This also supplies a means
of still maintaining the candle power when the batteries are
partially exhausted, by connecting them in series. However, this
must be done with very great caution, as the lights will be burnt
out if the voltage is too high.
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