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April, 1930]
NEW SIXTEEN MILLIMETER CAMERA
433
film, after each exposure, in its proper position in front of the aperture. The maximum possible angular opening of the shutter is 216°, which represents an exposure of 1/2eth of a second for each picture frame. The aperture plate, C, is of hardened, highly polished, stainless steel, and is easily accessible for cleaning purposes. The film tension is of the side-tension Bell & Howell type, controlled by a stationary film-guide rail, D, and a spring controlled film sidetension rail, E. This all-important feature of the camera distributes
FIG. 8.
A WORM SPINDLE
B GOVERNOR WEIGHT
C SPRING
D GOVERNOR HOUSING
G WORM GEAR
W WORM
1 POSITION OF D FOR
SPEED OF 8 PICTURES PER SEC.
2 POSITION OF D FOR
SPEED OF 16 PICTURES PER SEC.
3 POSITION OF D FOR
SPEED OF 32 PICTURES PER SEC.
C D
The governor of the Filmo 70D camera.
the film tension over a large film area, completely eliminating the necessity of pressure upon the back surface of the film.
The space between the aperture plate and the back plate is fixed to permit a free passage of the film with provision, through a spring arrangement, for allowing the passage of the splices attaching the paper or film leader to the light sensitive material.
We wish to emphasize here the importance of the elimination of back pressure, since it reduces to a minimum the danger of scratching either one of the two film surfaces, especially for those processes such as Kodacolor, in which both surfaces of the film play an essential part. This type of film tension permits an equal degree of accuracy of registration for both forward and backward running of the film, which accounts for the steadiness of the picture during the process of projection.
The speed of the camera is controlled by a governor of entirely