Richardson's handbook of projection (1930)

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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 xxiii