Cine-film projection : a practical manual for users of all types of 16-mm. (1952)

Record Details:

Title:
Cine-film projection : a practical manual for users of all types of 16-mm.
Date:
1952
Publisher:
London : The Fountain Press
Volume:
Cine-film projection : a practical manual for users of all types of 16-mm.
Leaf #:
00035
Language:
English
Collection:
Books
Format:
Books
Contributor:
Niles Essanay Silent Film Museum
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
March 21, 2024
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cessive heat (more than normal) will indicate that some part is badly in need of lubrication or is becoming badly worn. The intermittent cross movement is correctly known as the Maltese Cross (see Fig. 3). As you can see by the illustration, THE MALTESE CROSS MOVEMENT A is the shift pin and B the cam to which it is attached. The 1st drawing shows the cross at rest with the shift pin about to enter one of the slots, 2 shows the cross in motion, and 3 shows the cross checked again as the shift pin leaves the slot. To each complete revolution of wheel B, the cross moves J of a revolution. And each time the cross moves, the attached intermittent-sprocket (not shown) pulls one frame of film through the gate. The cross therefore handles 4 frames of film to each revolution, which explains why it is known as a 4-picture cross movement. the revolving shift-pin on the cam enters the slots in the cross, and to each complete revolution of the shift-pin the cross moves one-fourth of a revolution. If there are four slots in the cross, there will be four interruptions in each revolution of the attached sprocket-wheel, which means that it will shift four frames of film per revolution ; thus it is easy to see why it is known as a 4-picture movement. In narrow-gauge projectors, however, an 8-picture cross and sprocket is used, which implies eight slots in the "cross" and eight stops to each complete revolution of the sprocket. This movement is known as the Geneva, or Octomotive movement. (See Fig. 4). 31