There is another way of connecting batteries, and that is to obtain a
larger number of ampères. This is called connecting in multiple arc,
or for quantity.
[Illustration: Fig. 33]
Let us take again for an illustration the three cells giving each 2
volts and 10 ampères. This time we connect the carbon of the first to
the carbon of the second, and the carbon of the second to that of the
third; then we connect the zinc of the first to that of the second, and
the zinc of the second to that of the third, as shown in the sketch.
(Fig. 33.)
We then attach a wire to the zinc and one to the carbon in the third
cell, and we then can obtain from these two wires _only 2 volts_, but
30 ampères.
There are, again, many ways of connecting several of these sets
together, but it is not intended in this book to go into these
at length, for the reason that we only set out to give a simple
explanation of the first principles of this subject.
We shall therefore only give an illustration of one more method of
connecting batteries which will be easy to understand. This is called