Persons living in the city will find an economical means of
lighting lamps by securing exhausted batteries from any garage,
where they are glad to have them taken away. A certain number of
these, after a rest, can be connected up in series, and will give
the proper voltage.
In conclusion, for battery power: Connecting batteries in series
increases the voltage, and slightly cuts down the current or
amperage, which is the same as that of one battery; while
connecting batteries in parallel increases the amperage, but holds
the voltage the same as that of one cell. Thus, if the voltage and
amperage of any cell be known, by the proper combination of these,
we can secure the required voltage and amperage to light any
miniature lamp. And it might be said that dry cells are the best
for this purpose, especially those of low internal resistance.
[Illustration: FIG.2]
For those having a good water supply there is a more economical
means of maintenance, although the first cost is greater. Fig. 2
shows the scheme. A small dynamo driven by a water motor attached
to a faucet, generates the power for the lights.
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