Cinematographic annual : 1931 (1931)

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CINEMATOGRAPHIC ANNUAL A Laco Ba-rc'. Spot A Laco Rifle Mole-Richardson also introduced a new lamp for use especially in making closeups. This lamp is adjustable to all angles, and can be adjusted from 10 feet to the floor. It uses a 1000 Watt T20 bulb. A very similar lamp was also introduced by the Stone Fog Light Corporation. This lamp is adaptable from 250 Watts to 1000 Watts and weighs 27 pounds. Both lamps fill a definite studio need. The Stone Fog Light Corporation also introduced a new 18 inch studio lamp weighing but 36 pounds. Focal adjustment is made by means of a worm and gear arrangement. A new "spill ring" was also introduced by the Stone Fog Light concern. In the sound recording field the outstanding achievement in the mechanical development was reduction of ground noise. Two methods were developed; a biased valve method by Western Electric, and the RCA method which consists of rectifying a portion of the output of the recording amplifier, and using this current to keep the amount of light admitted to the film at a minimum. In the microphone field, RCA developed a new microphone for which directional pickup characteristics are claimed. It is called the Ribbon microphone. The ribbon microphone consists of two main assemblies, a microphone amplifier housed in a cylindrical aluminum case ten inches long and six inches in diameter, and the ribbon microphone transmitter suspended in a swivel mounting at the base of the amplifier housing. The swivel mount permits the aiming of the transmitter in any desired direction. The transmitter is enclosed within a perforated aluminum casing which protects it from mechanical injury. The illustrations show the microphone and the circuit wiring.