Kinematograph year book (1948)

462 The Kinematograph Year Book. being open is also seen, together with the lens mount adapted for modern heavy lenses, the massive curved gate, and above it the strip, of film which releases the built-in fire-prevention device. Page three shows the doors removed, and we see the arc with its 14^-in. mirror, and in the base of the stand the control panel and amplifier (in the second machine of a pair is installed the arc control gear). On page five we see the casings removed, showing the completely automatic striking and feed system for the arc. Page six shows the opposite side of the outfit, with the amplifier components on their withdrawable trays in the base, and below them the jacks which provide adjustment of projection rake. Page eight shows the offside appearance of the outfit. The remaining pages show the details of the mechanism which in the single unit comprises mute and sound heads. Already a number of these machines have been installed, and the results leave nothing to be desired. Gaumont-Kalee "21" The handsome appearance of the offspring of the union between Gaumont-British and Kalee, the Gaumont-Kalee " 21," with its beige housing and white control panels, makes it an ornament to any projection room. Its modernistic appearance is matched by the many up-to-date refinements incorporated in its mechanism. In operation the film path is totally enclosed, yet fully visible. The parallel opening gate is immediately detachable for cleaning ; behind it are twin shutters rotating in opposite directions, so giving maximum efficiency. Pyrene fireprevention equipment is installed, which in the event of a gate fire immediately drenches it in C02. The arc lamp incorporates a 16-in. mirror, and the large doors make it very accessible. Very fine control of the carbon feed rate is provided and striking is by a push-button system. The sound head incorporates drum scanning, and like the mute head has a gleaming white interior, making for cleanliness. The projector forms part of a complete installation, comprising also voltage amplifier with control panel, 30-watt main amplifier, and Duosonic speaker assembly, various models of which are adapted to different forms of auditoria. Walturdaw Five In the Walturdaw Five projector mechanism we find the outstanding features of design of the pre-war Ernemann projector, coupled with the standard of workmanship of one of our oldest manufacturing firms, Ernest F. Moy. In adapting the design to British manufacture, one shortcoming of the German design has been eliminated, and one British improvement added : the rather too small planet gears used in racking have been replaced by a more orthodox system of shutter-phasing compensation, while an improved Maltese cross design eliminates the mechanical incorrectness of the standard cross, which tends to give a temporary binding action just before and after the shift period ; the correction of this point makes for more silent running, which has always been a feature of the Ernemann. Water-Cooled Gate Two features were first introduced in the Ernemann, and are naturally retained : the rear drum shutter, with its simple flap-type safety shutter, and the water-cooled gate, which keeps the film cool, notwithstanding the most powerful illuminant. Another factor making for safety is the top loop guard, whereby, if this loop should enlarge due to a film break in the gate (which might lead to a gate fire) mercury switches cut out the arc and motor. Sound equipment to match the Ernemann projector has recently been announced. The sound head, although of the pull-through type, provides smoothing of the film path both before and after the scanning point, ensuring freedom from wow and flutter.