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206 HARRY W. JONES [J. s. M. P. E.
fiers were simplified, a power take-off for battery charging was added as was also an outside pick-up amplifier and mixer panel.
The power take-off added greatly to the mobility of the outfits in that charging was done while the truck was en route, or on the scene if necessary, thereby insuring a constant power supply. The outside pick-up amplifier was an even greater improvement. By its use an operator could take this portable equipment away from the truck to the scenes of action and there monitor more advantageously on either or all of the three microphone circuits available. By an intercommunicating system the operator was in contact with both cameraman and machine operator in the truck, and was often able to get worthwhile shots that might otherwise be missed where operation is solely from within the truck.
The demand again came for lighter and more portable equipment and this time the RCA Photophone laboratories produced a Mitchell camera equipped with a variable area recorder built as an integral part. A light amplifier accompanied the Mitchell and with only 6 volts for power supply the whole made a real portable outfit. The equipment fits nicely in the new business body sedan of a light and fast car, so the operators now tour in style. There are several improvements on this outfit worthy of mention. A dry galvanometer replaces the oil damped model in general use. For portability the advantage of this absence of oil is very apparent, and the current needed to drive it is considerably less than the oil damped type. An optical system requiring much less space and using a focused filament image in place of a mechanical slit is among the newest additions.
Sound on this Mitchell portable equipment is recorded at projector spacing, or the standard 14.5 inches ahead of the picture. As recording is done by the variable area method, development and printing can be done in virtually any laboratory on the road even though not equipped with sound printer, so rushes or quick news releases may be made almost anywhere. Quality compares favorably with the twomachine method and the total equipment weighs less than four
hundred pounds.
DISCUSSION
MR. HAMMOND: May I ask why more even sound level is not maintained in making the positive?
Subjects are cut off very abruptly, in the middle of a word often, and instantly it goes into music accompanying the title.
MR. JONES: We regulate sound level to the best of our ability, but the record is made under such varying conditions that it is very difficult to get an even level.