Digital heart book

You
will find it your most useful servant, and in connection with aluminum it
will enable you to solve numerous problems and remove many difficulties
from your path of progress.
"Here we have made full use of both of these valuable helps. Electricity
enters into every department of life.
"It runs our errands, takes us from place to place, builds our houses,
cooks our food, and even is applied to the growth of our food when we are
in haste for any article. Its laws are so well understood that there is no
fear of personal injury from its use, and I will show you how familiar an
aid it is to us. Here," he continued, taking from his pocket a brightly
polished case of metal, "is a compact storage battery, containing, not
electricity itself, of course, but elements so prepared that a simple
touch will start into motion a powerful current, able to perform almost
any task I may ask of it. This case, you see, is so small and light that
it is no burden, and yet it contains power enough to serve me for many
days.


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