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The Story of Electricity

John Munro

Book Overview: 

It is interesting to learn what progress had been made in the fields of electricity and technology by the beginning of the 20th century.

Including the dawn of hydro-electric power, the x-ray, the phonograph, the telephone and the wireless telegraph, this book explains the pioneering work of the men who made our modern world possible, and sets us wondering what the next century may bring.

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Book Excerpt: 
. . .two poles or centres of attraction, which are situated near its extremities. Sometimes, indeed, when the magnet is imperfect, there are "consequent poles" of weaker force between them. One of the poles is called the "north," and the other the "south," because if the magnet were freely pivotted like a compass needle, the former would turn to the north and the latter to the south.

Either pole will attract iron, but soft or annealed iron does not retain the magnetism nearly so well as steel. Hence a boy's test for the steel of his knife is only efficacious when the blade itself becomes magnetic after being touched with the magnet. A piece of steel is readily magnetised by stroking it from end to end in one direction with the pole of a magnet, and in this way compass needles and powerful bar magnets can be made.

The poles attract iron at a distance by "induction," just as a charge of electricity, be it positive or negative, will at. . . Read More

Community Reviews

1915! Too old to be useful except for knowing the perspective of that time.