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Equipment and Technique in 1926.
221
epicycloidal Maltese cross movement, which effects a picture change in 30 degrees of movement.
SAFETY DEVICES.
Apart from those devices that are essential accessories to particular projectors, two new Continental apparatus claim attention by reason of their absolute efficiency. Both depend on the principle of playing currents of air on each side of the gate. The Aeronor apparatus comprises a small £ h.p. motor air compressor that forces cleansed air along to two fitments, one at the bottom of the aperture plate and the other at the top of the gate channel. An additional automatic safety air-operated fire trap is included. The Walturdaw safety device possesses an ^ h.p. motor and air pump, which forces an air current through a water chamber where it is cleansed and cooled before being propelled to the tube distributors on the gate. Tests of both apparatus show that films will stand up unscathed for up to 20 minutes under 25 to 30 amps, with mirror arcs. There is also, of course, the wellknown " Vintalite " attachment which practically halves the intense gate heat produced by mirror arcs.
HIGH INTENSITY ARC LAMPS.
The merits of the High Intensity arc have been recognised by the majority of the largest American kinemas, and the past two years have witnessed a remarkable accession to the number of uses of this illuminant in this country. The H.I. arc is claimed to be the more brilliant source of pure penetrating light obtainable for projection purposes and thus difficulties hitherto encountered with dense film atmosphere is obviated.
One of the first lamps of this type on the market was the Sunlight arc, distributed by Duncan Watson and Co., which incorporates all the desirable features of the H.I. arc and has a very ingenious device to control the fading of the electrodes. The Walturdaw H.I. arc is found in many of the better class theatres and is so constructed that it requires no adjustment during operation. Three types of lamps are stocked : for 50 amps., 75 amps, and 100 amps. Similar in design is the Hall-Conelly H.I. arc, marketed by Frank Brockliss and Co., Ltd. and E. A. Langrish and Co., Ltd., which although only quite recently introduced is already firmly established in popularity. There is also the Ross arc, to which allusion has already been made. Not only can it be used as an H.I. lamp, but, if desired, also as an ordinary minor lamp — 'almost a universal lamp.
NON-FLAM FILM.
The closing months of the year witnessed the announcement of a new non-flam base, the invention of an Englishman, H. J. Mallatar, F.R.P.S. The product in which strong financial and scientific interests are concerned has this important characterisation, that its flexibility increases rather than decreases with the passage of time, while in mechanical properties, purity of colour, it is also the equal in every respect to standard films. A factory is being projected designed for an output of 250 million feet annually. Hot on this came the announcement from S. Rowson, of Ideal, that he was interested in a non-flam base which as a test film had been circulated to his
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