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MANAGERS AND PROJECTIONISTS
Name the requisites for perfect results, in so far as has to do with the exciting lamp and its optical system 1057
What will the conscientious projectionist do every day with regard to the exciting lamp ? 1059
Is it true economy to continue to use an exciting lamp after its filament is sagged or its globe discolored? 1059
What harm will a sagged filament do to results?... 1059
Why will the sagged filament work harm to results? 1059
How would you proceed to test the sidewise adjustment of the exciting lamp filament image at the sound track ? 1059
Should you have an exciting lamp always ready?... 1061
How may you have an exciting lamp always ready when using Western Electric equipment ? 1061
When using Western Electric equipment how ma}' the spare lamp be installed when an exciting lamp fails and the show is running? 1060
Describe the process of adjusting a Western Electric exciting lamp in the spare socket so it will be ready for immediate use 1061
What should you do after you have completed the adjustment of a spare exciting lamp in the spare socket? 1066
Horns and Loud Speakers
Is it right to call a "loud speaker" a horn or a "horn" a loud speaker ? 1067
Is the term "horn" the correct one to apply to the sound projector using a bell-mouthed shell? 1067
What part of the sound projector now commonly dubbed a "horn" is really the horn? 1068
The Receiver
Describe the sound projector "receiver" 1068
Of what is the receiver diaphragm made? 1068
Why is the diaphragm made in a "cupped" form?.. 1070
What does the receiver do ? 1072
The Horn
Explain, in detail, just what the "horn" of a sound projector really does 1072
Why is it impossible to get satisfactory sound with the horn removed from a sound projector? 1072
What has the shape and length of the horn to do with the volume and quality of sound delivered to the air ? 1075
What is the secret of the horn action? 1075
What would happen if the horn were not tapered from point to point in exact accordance with the
exponential curve ? 1076
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