... when this picture, reproduced here from the First Edition of the Encyclopaedia Britannica, was published, only the most elementary principles of electricity had been discovered. Benjamin Franklin's discovery, made with the aid of a kite, that lightning is an electrical phenomenon, was the greatest advance in electrical science up to that time. "Electrical machines," such as that shown, were, designed to produce frictional or "static" electricity, of which the quantity is usually ... — The Greatest Highway in the World • Anonymous
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