Kinematograph year book (1928)

Equipment and Technique in 1927. 225 Power's 6B and consists of small movable sleeves which fit over the pins of the pin cross, and, acting as roller bearings, reduce frictional wear and noise to a minimum. The pin cross rollers are made of specially selected steel, hardened and finished with the utmost care. Other special features include the new and improved front plate and lens mount with its rack and pinion adjustment with double focusing knobs, which permit of the lens being easily focused from either side. The mount proper consists of a split collar clamped by means of a set screw which holds the lens firmly in position. Framing is facilitated by a small framing lamp mounted inside the mechanism in a most convenient position. A double eye-shield of ruby glass covers the aperture. By means of a vernier adjustment, the blades of the cover shutter may be adjusted during running ; a clutch to the take-up sprocket permitting facile adjustment of a short lower loop. The generator type speed control is a refinement that all operators will appreciate. Absolute accuracy and dependability are claimed for it : by setting the double-ended control lever and then simply throwing in the motor switch, the projector speed will at once reach the exact speed for which the control is adjusted, and if used in conjunction with the Power's speed indicator, the problem of the correct timing of pictures is eliminated. Another advantage of the control is that a drop of line voltage should not affect the speed of the mechanism even if the motor slows down considerably. Minor points of difference with previous models are the round-cornered spool boxes, and the more substantial construction of the stand. ROSS D.C. MODEL. Among the most interesting of the new models is the improved Ross D.C. Model, in which the chief departure from the former models of this famous machine is the adoption of the fixed optical centre principle. One result of this application is that the loops above and below the intermittent sprocket remain of constant length and no allowance need be made in their length for racking. Moreover, the film is not being pulled through the gate during this operation as the film track moves with the film. Spur gearing and bevel gearing has been entirely eliminated, and is replaced in the new Ross by worm gearing, thus achieving absolute silence in running. Owing to the materials used, these gears are immune from wear, and indeed will improve during service. The Maltese Cross movement is now enclosed in an airtight oil bath and the cross itself has also been improved. The complete unit is easily interchangeable. By means of an interesting new feature it is possible so to reduce the area of the light spot at the gate aperture that the temperature of the film track is very sensibly reduced. The new construction of the film track prevents " flapping " of the film when running on to the intermittent sprocket. This extremely fine adjustment of the lens will appeal to operators. This is provided by the new focusing jacket, which can be moved through a fraction of an inch. The stand is now a pedestal arrangement with changeable extension pieces by which the height of the machine can be easily arranged to suit any particular tilt and height of port hole. ■ FOR EVERYTHINGEXCEPT FILMS "T MOVOMNIA PHONF.-NORTH 2652-1978 • 120, DAYHAM STREET, CAMDEN TOWN.L0ND0N.N W.i. ■ ^ 'ncIrwe'st'^.On'd' H