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OPTICAL SOUND
is a special red "press-to-record" button, which will operate only when the projector motor is in the forwardrunning position. When the motor is reversed or shut off. the button is disengaged and cannot be re-set until the motor is in the forward-running position and the button deliberately pressed again. Thus, if the operator makes a recording and decides to reverse the machine and play it back immediately, this foolproof safety device makes it impossible to erase the recording accidentally. As a visual aid. a small pilot lamp located directly above the press-torecord button indicates when the button is engaged. This automatic cutoff of the recording function when the projector is reversed should be of special value when backtracking one's film to correct minor mistakes in recording.
MIXING PHONO AND MIKE A phonograph, tape recorder, or FM tuner can be played through the phono jack when the projector is being used either as a recorder or PA system. The master volume control will control the output of the amplifier. But if voice is added, the phonograph (or other instrument used) must have a separate volume control so that the proper signal balance can be obtained for mixing the microphone channel with the phonograph channel when adding background music to narration. The mike jack is for a microphone only: the average phonograph will deliver too large a signal, resulting in a distorted tone.
MAGNETIC AND OPTICAL Perhaps one of the more revolutionary aspects of magnetic recording is the "half-track" coating which has come out of Bell & Howell's work with magnetic sound. This term means that magnetic material can be coated over one half of an optical track without causing any appreciable loss in sound quality when the latter is played. Thus the two tracks side by side offer possibilities for an indefinite number of interesting applications — commentaries for two different types of audience on the same film, two languages, etc. [Continued on page 61 ]
MAGNETIC SOUND
MAJOR CONTROLS OF 202 are seen above set for magnetic playback, and at left for optical sound. Numbered features are (1) silent or sound speed switch; (2) control lever governing function of sound scanning drum; (3) three-place sound selector knob, reading (I. to r.) magnetic record, magnetic play and optical play. Outer knurled rim of same knob is separate microphone volume control, while at right are mike and phono inputs, recording safety button and telltale pilot light.
RECORD-PLAYBACK heart of the 202 is closeup-ed above exclusively for "Movie Makers" to show clever positioning of sound magnets. Uncovered at right is exciter lamp, optical lens system and mirror.