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HANDBOOK OF PROJECTION FOR
Disc Record Recording
What is a "disc record" ? 987
Name various points of difference as between the records used for recording synchronized sound and ordinary phonographic records 987
At what exact speed must the Vitaphone record rotate ? 987
Does needle on Vitaphone record travel from outside to center, as does the ordinary phonograph record needle ? 987
Describe the Vitaphone disc record groove 987
Is the record of sound carried in bottom of the groove? 988
Tell us just how the sound record is made on disc records 988
RCA Photophone Recording
What kind of camera is employed in RCA Photophone recording ? 996
What else beside a motion picture camera is used
in RCA Photophone recording?. . . 996
In what does the film used for recording RCA motion
pictures and RCA sound differ ? 996
How are the RCA camera and sound recorder made
to run at exactly the same speed? 996
Describe the RCA Photophone sound recorder 997
Describe the process of recording RCA sound 997
Where is the "mixing panel" located and what is it
for? 997
How weak is the microphone current? 998
Where does the microphone current go from the last stage of amplification ? 998
How Record Is Made
Of what does the oscillograph galvanometer consist? 998
Where is the oscillograph galvanometer located ? . . . . 998
In what kind of field is the oscillograph galvanometer located ? 998
What is the purpose of the oscillograph galvanometer? 998
What kind of light source does RCA Photophone employ for making the sound record? 998
In what position is filament of recording light source held ?-.... 998
Upon what is recording light source focused and by what? 998
What are the dimensions of the RCA Photophone
recording slit ? 999
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