Wireless Telegraphy and Telephony
Forfatter: Alfred P. Morgan
År: 1917
Forlag: The Norman W. Henley Publishing Company
Sted: New York
Udgave: Third Edition, Fully Illustrated
Sider: 33
UDK: 621.396.1 Mor
A practical Treatise on Wireless Telegraphy and Telephony, giving Complete and Detailed Explanations of the Theory and Practice of Modern Radio Apparatus and its Present Day Applications, together with a chapter on the possibilities of its Future Development
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112
WIRELESS TELEGRAPHY
produced in this manner are transmitted to the ear, and
the sensation of sound is caused by the impact of the
otoconia against the auditory nerve, giving a series of
impressions, musical or unmusical, pleasing or displeasing,
as the case may be. Many interesting experiments showing
the nature of the sounds of the human voice may be per-
formed by means of a simple apparatus invented by Koenig
of Paris. A box is separated into two compartments by a
rubber membrane. Gas is led into one of these compart-
Fig. 130.—Appearance of manometric flames in a revolving mirror.
ments by a rubber tube, and then allowed to issue to a
burner. The other compartment is connected to a mega-
phone.
Two pieces of mirror are arranged so as to revolve in
front of the lighted jet or burner. When the human
voice is produced in front of the megaphone, the air
waves strike the membrane and cause changes of pressure
in the gas. The height of the flames varies with each
change in the pressure, and when viewed in the mirror
resemble a band of light having an edge like a saw.
The teeth are faithful representations of the changes in the
voice, and immediately take on a new appearance when a
new sound is emitted. The shape of the teeth changes with