The Telephone An Account of the Phenomena of Electricity, Magnetism, and Sound, as Involved in Its Action

This leads to the inquiry as to what magnetism is. We know that it can produce motion by its moving at a distance a piece of iron or another magnet. It will also sustain a mass...

But Helmholtz did not stop after analyzing sounds of so many kinds: he invented a method of synthesis, by which the sounds of any kind of an instrument could be imitated. A tuni...

Let N S, Fig. 3, be a bar of hardened steel rendered permanently magnetic. If now there be brought near to it a board-nail, the latter will become a magnet through the _inductiv...

THE popular exhibitions of the speaking-telephone during the past six months, together with numerous newspaper articles, have created a widespread interest in the instrument; an...

When it is once understood that a musical sound is caused by the vibrations more or less frequent which only make the difference we call pitch, it might at once be inferred, tha...

My first speaking-telephone, Fig. 14, consisted of a magnet made out of half-inch round steel bent into a U form, having the poles about two inches apart. Over these were slippe...