Richardson's handbook of projection (1927)

Page scan 000358 from Richardson's handbook of projection

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000358
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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806 HANDBOOK OF PROJECTION FOR Figure 306A The Complete Ashcraft Unit the arc end of the carbon the gripping is done quite close to the front end. This arrangement has two distinct advantages. It causes the current to enter the carbon near the point at which it will be used, thus minimizing the heating effect. In conjunction with baffle plates J. Figure 306A it prevents the crater of a carbon which is not perfectly straight from gyrating. The rear end of the carbon being entirely free, it can and does gyrate (wabble) if the carbon be not perfectly straight, but that does no harm. The positive contact shoes, 100, figure 305A, slip into a slot machined through the positive nose, M, figure 306A. They are made from a cold-rolled alloy. The tension arms, F, figures 305A, pass down obliquely, and are pivoted at 107, figure 306A as shown. There are two of these arms, one on either side. At their upper ends they each bear on one-half of the split contact shoe through which the carbon passes. Between their lower ends as shown at G, figure 306A and G is a coil spring,