Note presented to the Academy of Sciences, Oct. 19, 1885.
ON THE THEORY OF THE RECEIVER OF THE ELECTRO-MAGNETIC TELEPHONE.[2]
By E. MERCADIER.
On a former occasion I described some experiments that had led me to a theory of the telephone transmitter; a few words will suffice to expose that of the receiver.
Such theory gave rise during the first years succeeding the invention of the telephone to a considerable number of investigations, the principal results of which may be summed up in the two following points:
1. All the parts of a telephone receiver—core, helix, disk, handle, etc.—vibrate simultaneously (Boudet, Laborde, Breguet, Ader, Du Moncel, and others). But there is no doubt that by far the most energetic effects are those of the disk. It has been possible to put the vibrations of the core and helix beyond a doubt only by employing very energetic transmitter currents, or very simplified and special arrangements of the receiver (Ader, Du Moncel, and others).