Richardson's handbook of projection (1930)

HANDBOOK OF PROJECTION FOR Just what happens if we connect the microphone to a suitable source of electric power and cause its diaphragm to vibrate with sound ? 969 In just what way or manner is an electric current set up in a circuit to which an air condenser microphone is connected ? 970 Just what kind of current is set up in the circuit to which the microphone is connected ? 970 Upon what will depend the frequency of the current set up by a microphone ? 970 To what will the strength of the current set up by a microphone at any instant of time depend ? 970 For what reason is one stage of amplification usually given at the microphone ? 970 How many times must the current set up by a microphone be amplified before it can be used to operate horns or loud speakers ? 970 In recording sound, must the microphone be placed near the camera ? 976 In recording, to what does the wires from the microphone attach ? 976 What is the dimensions of the line of light which record the sound on film by the variable density process ? 976 What is the voltage of the recording microphone circuit ? 976 •How many times is the microphone circuit amplified, when recording on variable density sound track before it operates the Aeo lamp ? 977 Recording Sound Name one big difficulty encountered in recording sound in synchronism with motion in motion pictures 972 How many methods of recording sound are in general use ? 973 Upon what is the sound recorded in two of the methods used ? 973 Upon what is the sound recorded in one of the methods now used ? 973 Name and describe two methods of recording sound on film 975 Do both methods used for recording sound on film give good results ? 975 On which side of the film is the sound track located? 975 What is the width of the sound track? 975 Does the sound track affect the dimensions of the motion picture and if so, how? 975 Describe the method of recording sound by the variable density process 975 xii