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quires cleaning) drops down in place behind the aperture — an automatic movement which takes place each time the mechanism is stopped.
The optical system is equally efficient, and has obviously been carefully designed for maximum illumination and definition. The lenses are, of course, specially coated, the objective being speedily interchanged with 2" ones supplied as standard.
There are many other refinements, but space forbids a complete description of them all. The author must therefore confine himself to a further brief statement of fact — which is that the Model 601 is one of the best 16 mm. sound projectors yet produced, and he'd very much like one for a Christmas present.
Model 601 is distributed in Britain by G.B. Equipments, Ltd., Imperial House, 80-82, Regent Street, London, W.i.
VOLTAGE — 200/250 A.C. using a step-down transformer. For D.C., use a rotary convertor. But check your "Owner's Manual" first.
B.T.H. Type-301 Projector
This new 16 mm. projector is designed on the unit principle for simple and speedy servicing, and complete sections may be removed and replaced quickly when necessary. The entire intermittent mechanism, including the gate, shutter, etc., may be withdrawn as a complete assembly — a simple operation easily performed. The amplifier forms another complete unit, and is just as easily replaced.
Maximum screen illumination is provided by a new type 500watt or 750-watt projection lamp coupled with the latest optical system having surface-treated (bloomed) lenses, and an aspherical mirror. A fast "pull down" time plus a relatively narrowbladed shutter ensures that a maximum amount of light reaches the screen, and the result is a picture of surprising brilliance.
The objective lens normally supplied is a 2" F.1.65, but others of various focal lengths are available when required. All, of course, are "bloomed" for maximum efficiency.
A single driven sprocket, wide-opening gate, and a quick threading lever, gives the simplest threading yet devised, and a novel spring-loaded two-claw intermittent mechanism ensures a rock-steady picture. The gate is also provided with delicately spring-loaded skids of stainless steel, making "thread
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