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INDEX TO
Volume III
Sound
What is sound — of what does it consist? 967
How is sound transmitted through the air? 967
What is meant by "frequency" as applied to sound
waves ? 967
In shrill, high-pitched sound is the frequency high
or low ? 967
How many possible variations are there between the
highest and the lowest sound ? 968
Upon what is the tone or quality of sound dependent? 968 As frequency is raised or lowered, what is the effect
on sound ? 968
By what is the force of an air wave governed?.... 969
The Microphone
How does a microphone operate ? 967
Of what is the air condenser microphone made?.... 967
What is the thickness of an air condenser diaphragm? 967
At what speed does the microphone diaphragm vibrate? 967
Describe an air condenser microphone 968
What type of microphone is now in general use for recording sound ? 968
What is the distance of separation of the plates of an air condenser microphone ? 968
Describe the back plate of an air condenser microphone 968
Does the back plate of an air condenser microphone move or vibrate ? 969
Describe the effect of the movement of an air condenser diaphragm 969
Upon what is the amount or depth of vibration of the microphone diaphragm dependent? 969
Will each variation in air wave frequency, no matter how slight, cause a variation in rapidity or frequency of the vibration of the microphone diaphragm ? 969
Just what effect has each difference in separation distance of the front and back plates of a microphone have ? 969
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