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sync, and the latter smoothly controlling volume throughout the frequency range by a new "stepless" movement. The switches, all plainly marked, are for lamp, motor, sound /silent, and reverse /forward movement. There is also a pilot light which lights-up automatically when its casing is pulled forward, the case shielding the light from the face of the operator.
A special feature of this machine which should be noted is the unusual but highly efficient smoothing system. Known as the Oscillatory Stabiliser, it consists of two rollers which are freerunning yet ingeniously interlinked, and so arranged that the film is smoothed both before and after it has passed over the sound-drum. The system ensures unvarying film-speed at the point where the film is scanned, thus completely eliminating 'flutter'.
The removable spool-arms are carried inside the projector case (the blimp), one on the door and the other at the rear of the case. Both are fastened by thumbscrews accessible when the upper large door of the blimp is opened. Film capacity, governed by the size of the spools which can be accommodated, is up to 2,000 feet.
At the end of the rear spool-arm is the combination mechanism for both rewind and take-up — extremely simple yet highly efficient. No adjustment or compensation is necessary for various spool sizes, since the flat fabric belt between the two pulleys provide complete and automatic compensation without any manual adjustments.
Although a 750-watt prefocus lamp is supplied as standard, any Class Ai projector lamp up to 1,000 watts may be used in perfect safety, but note that the lamp's base-flange is of a special type for the Bell and Howell range of projectors. The flange (or lug) is fitted with a flat guide-pin, which ensures that the lamp is always correctly inserted without fumbling for the right position. Cooling is provided by a powerful "blower," which keeps not only the lamphouse and gate-area at the right temperature, but also the amplifier as well.
Another well-designed feature is the still-picture device, which is manually operated when it is desired to arrest picture movement. It is really a clutch, and when it is actuated it disconnects the mechanism from the main drive. To prevent the film from heat-damage, a perforated metal safety-shutter (which never re
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