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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WIRELESS TELEGRAPHY
II3
the tone, and the number of teeth with the pitch. Fig. 130
shows the flames produced by singing the sound oo, as in
tool. The same sound an octave lower in pitch will show
as in. B, where there are just one-half as many teeth or
vibrations. The sound of 00 is a simple sound. If 0 on the
note
is sung into the megaphone, the image in the mirror will
appear like that shown by C, being made up of alternating
large and small teeth, the former corresponding to every
alternate vibration of the octave of the higher sound coin-
ciding with a vibration of the octave below.
The sound causing the flame to appear, as in D, is made
up of two simple vibrations combined.