Another
interesting test was made. The electric current for a Hauckhousen lamp
was passed through a long coil of solenoid wire. Separated from this
coil by a single newspaper, lay a coil of wire attached to telephones,
yet not a sound could be heard in the telephones but the voices of the
persons using them. The current of electricity created by a
dynamo-electric machine is of necessity a violent one, and in the use
of ordinary wires the induction would be so great that no other sounds
could possibly be heard in the telephones.
* * * * *
DR. HERZ'S TELEPHONIC SYSTEMS.
In an article by Count du Moncel, published in SCIENTIFIC AMERICAN
SUPPLEMENT, No 274, page 4364, the author, after describing Dr.
Herz's telephonic systems, deferred to another occasion the
description of a still newer system of the same inventor, because at
that time it had not been protected by patent. In the current number
of _La Lumiere Electrique_, Count Moncel returns to the subject to
explain the principles of these new apparatus of Dr. Herz, and says:
I will first recall the fact that Dr. Herz's first system was based
upon the ingenious use (then new) of derivations. The microphone
transmitter was placed on a derivation from the current going to the
earth, taken in on leaving the pile, and the different contacts of the
microphone were themselves connected directly and individually with
the different elements of the pile.
Pages:
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115