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Fig. 5. Open rolls of film on machine.
toward the right; from it a shaft with a universal joint extends diagonally downward. Just right of the synchronizationcontrol wheel is the speed control knob; from it a shaft extends vertically downward to a sprocket; and from this sprocket a chain runs leftward to the housing of the combined motor and stepless speed control gear. The V-belt drives to the four turntables are plainly visible, and at the extreme left there is a glimpse of one of the relays that control and reverse the drive motor.
The machine can accommodate either open rolls of film, or film on reels, as shown in Figs. 5 and 6 ; there is no need to take time out and delay proceedings merely to put film on a reel or take it off one — it can be taken either way it comes. How this is accomplished is shown in Fig. 7, where the spindle for open rolls has been lifted off and placed to one side, revealing the spindle used when film is on a reel. Up to 2,000 ft of film in one roll or reel can be accommodated.
The heart of the Precision Film Editor is the shutterless continuous projector.
The lamp used for projection light is actually a sound exciter lamp of 10 v, ?i amp rating. Screen illumination at 75 w is ample.
From the lamp the light path is through a condenser lens and then through the film. Film motion is, as the pictures show, lateral instead of vertical. After passing through the film the light enters and traverses a 12-side revolving prism. This prism can be described as a disk of optical glass as high as a frame is wide, rotating horizontally behind the film;
Fig. 6. Film on reel on machine.
Fig. 7. Spindle for open rolls placed to one side to show spindle for film on reels.
this disk, however, is not circular, for its rim has been ground to a duodecagon. Each prism face has approximately the same dimensions as one frame; and the rate of rotation is 2 prism faces per frame in the same direction as the film.
On emerging from this rotating 1 2-face prism the light beam passes through the projection lens and then into an assemblage of three motionless triangular prisms. These latter perform three functions: by their agency the light beam is deflected upward; the image is erected so it will appear erect on the screen; and, finally, the light beam is deflected forward, above the top of the rotating prism housing, to the screen.
In Fig. 2 the projection lamp and condenser lens are inside the housing nearest the screen. Thence the light path is forward, through the film, toward the operator. Having passed through the film, the light proceeds to and through the rotating prism under the circular housing. On the near or left side of the
Torben John ke: Film Editor
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