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sprocket-wheels and spindle-driven take-up, and to the fact that there are no internal belts or chains.
The spool-arms are quite sturdy and rigid, and are designed to carry spools of 1,800 feet capacity. They may be folded back into the machine when not in use.
The oil supply for the lubrication system is clearly visible within a perspex container mounted on the top of the machine. The rate of flow is fully adjustable.
Light for the sound-system is provided by rays picked up from the bottom of the projector lamp. A readily adjustable prismatic condenser lens on the top of the sound optic unit is provided for compensating differing positions of lamp filaments. A unique feature is the accessible and readily removable sound drum for cleaning the optical system. Constant speed of the film through the soundhead is ensured by the heavy but perfectly balanced flywheel, weighing 4J lbs. and measuring 5| inches in diameter.
The amplifier is constructed as a separate unit and is housed in the base of the projector, and from where it may be withdrawn by merely removing a few screws and then lifting the projector upwards and away from it. The sound output is unusually high for a 16-mm. projector — 25 watts; but this is something we have often wished for when forced to use a print with a very low recording level. The amplifier is a 5-valve 4-stage job, with pentodes in class "A" push-pull output-stage and negative feed-back incorporated. Separate top and bass tone-controls are also provided, and both speech and music are perfectly reproduced without any of the usual blurring of extended frequencies. A number of speakers may be used if required.
Threading is made extremely fast and simple by the whole layout of the film track, the film being guided by semi-circular channels towards and over the sprockets, and the bottom loop formed automatically. There are no spring rollers to cope with.
The controls are grouped together on a panel on the operating side of the base, and inputs are provided for microphone, nonsync, or for a monitor speaker or headphones. The loud-speaker is of the permanent magnet type, and a 12" speaker is supplied as standard with the machine. The speaker cable is of 75 feet, and when not in use is kept within the speaker carrying case. A socket is provided in the speaker case for connecting an additional speaker.
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