Cinematographic annual : 1931 (1931)

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MACH1N Em DEVELI H'.M ENTS 4H RADIOTRONS COUPLING INPUT TRANSMITTER TRANSMITTER FIELD UX-864 CONDENSER'C" TRANSFORMER SWIVEL CLAMPING SCREW /COIL RUBBER. SUSPENSE CUSHi COUPLING RUBBER \ CAPACITOR PACK CONDENSER BUFFER (FILTER CONDENSERS TRANSMITTER CUSHIONS "A"ANDV'B") RIBBON COVER ~*ype PB-17 Ribbon Microphone with cover3 removed ic show K^aiotrons and arrangement of parts OUTPUT TRANSFORMER CAPACITOR 'PACK RESISTOR MOUNT'NG BOARD CHOKE Type PB-17 Ribbon Microphone with amplifier ;ver removed (reverse of Figure 2) A new "bomb" type of microphone has also been developed by the sound department at the Metro-Goldwyn-Maycr studios. This is said to have proven very satisfactory. Another "bomb" microphone has also been introduced by the Hollywood Motion Picture Equipment Company.