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177
T fl E (' I X E-T E C II XI C I A X
Dec -Jan., 1037-8
OPTICAL PRINTING [continued from p. 175)
able working space between camera and projector and a
speed of -1..") should he ample. ,\ well diffused tubular
projection lamp of 1,000 or 1,500 walls is verj satisfactory lor printing light and the motor must be strong enough to drive the machine without speed fluctuations.
All optical printers usually start with the simple laj out described. There is no standard, each is more or less individual, but if the printer is properly designed from the start, additions can be made easily to become permanent parts of the machine.
As a particular example of design, the optical printer used h\ the Olympic Kinematograph Laboratories may he described. Figs. 2 to !l show different views of it. The machine is one of the most modern in design, very easy and precise in operation and extremely efficient tor allround trick work.
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Figure 2
Fig. 2 is a complete view of the machine. The lathe bed is 8 feet long, allowing lull range fur enlarging and reducing work. At the extreme left can be seen the motor and gear box (A). B is the main driving shaft. C and D, projector and camera driving shafts. E, the transmission gear box, through shafts F and (! to rear camera platform, which is seen with the screen staging on the right of the picture.
speeds, 1. 8 or 16 feet per minute; C is the printer head. This is a standard Bell & H 1 II camera of the shuttle gate type, with the rear pressure plate removed to lull aperture clearance, h is a tube carrying air at a pressure of 30 lb. to the square inch to thi gal just below and behind the aperture. This is to prevent breathing" and to remove any dusl re the film
enters the gate. E is the projector driving shaft. F is the stop-motion gear, and G the "ear lever. H is I footage counter, which i rs frames. This
essential, as all work is done 1 turn 1 picture and must be correctly timed to the frame. I and J are calibre" controls for vertical and lateral movement of the projector. K is the lamp house, and L a water tank to reduce 1 at the aperture. The light is reflected to the a] by a white card >\Ii sel a1 the required angle. In the case of glass shuts a surface silvered mirror is substituted for this card, giving a much higher light transmiss
Figure 4
Fig. 4 clearly shows the lay-out of the three membi rs A is the printer head. B the lens, C and D calibrated controls for its movement, and E the camera. This also is a shuttle gate type Bell & Howell, in which the pressure pad has been cut away and a prism mounted behind the aperture with a look through window (F) in the camera door. This view also shows a device (G.H.I.) for printing alternate frames or one frame in three or vice vers
Figure 3
Fig. 3 shows the machine from the projector end. A is the motor; ll. a gear box giving choice oJ three
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