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OUND-ON-FILM pictures in the home
Sbecome an easy possibility for any home Playback is similarly accomplished, the weights
movie maker who owns a microphone, a home being raised. The delicately balanced pickup
movie projector, a radio receiver and a new exerts enough pressure to cause the needle to
recording and play-back device called the follow the groove, but not enough to cause
Filmograph.
appreciable wear on the film. In fact, the
Essentially, this device consists of a magnetic manufacturer claims that, instead of making it
pickup, mounted in a special fitting which is weaker, the slight corrugation it makes actually
provided with a film track. It is used in conjunction strengthens the film! Models are available for use
with a standard home movie projector, which with 8, 16 and 35 mm film, and the standard which
draws the film under the needle of the pickup at the supports the head is adjustable, so that the device
same time the picture (23 frames, or sprocket holes may be employed with any make or model of
away) is projected upon the screen. projector. Synchronization can, of course, be had
as the recording is actually on the film.
For recording, a microphone is connected to the
audio amplifier input of the radio receiver, the In addition, the Filmograph can be employed for
output being connected to the pickup head instead straight recording on film, in which case blank or
of to the loudspeaker. Thus the audio frequencies, spoiled film maybe used. It can be set to record 28
generated in the microphone and amplified in the parallel grooves on a strip of 16 mm film, and the
set's audio stages, operate the pickup. economy of this is obvious when one realizes that
a total of 4 hours and 40 minutes of sound may be
A sapphire-point needle, placed in the pickup, recorded on and reproduced from a 800-foot length
impresses a channel 2/1,000-inch deep in the non- of film! The recording on a 300 foot roll of film is
emulsion side of the film. The groove is but the equivalent of that possible on 51 discs, each 12
1/1000-inch wide, and the audio frequency
impulses cause the corresponding pattern to be inches in diameter. (See upper film, Fig. C.)
indented upon the sides of the groove. Nothing is Portability is another point featured in the new
cut from the film - no celluloid curls from the recording device, which weighs but 6 pounds
"cutting" head during recording. The groove is so complete. It can be furnished with pickup units of
small as to be unnoticeable when the film is any standard impedance, to match the output of the
projected upon the screen. Pivoted weights afford set with which it is to be used, and is said to give
the necessary pressure for recording. (See lower fidelity of reproduction of audible frequencies
film, Fig. C.) from 50 to 5,000 cycles.
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