Richardson's handbook of projection (1927)

Page scan 000394 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 #:
000394
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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842 HANDBOOK OF PROJECTION FOR Figure 315H Lamphouse, showing lamp which may be withdrawn is no up and down adjustment provided for the positive carbon clamp. However, because of the fact that carbons of different diameter may be and are used, a side-wise adjustment is provided. This movement is accomplished by means of knob G, Fig. 315D. The negative carbon clamp, on the other hand, has no sidewise adjustment, but knob F, Fig. 315D, provides a vertical movement. You have, therefore, only to install the carbons in their respective clamps, and so adjust their tips, by means of knobs G and F, Fig. 315D, that the center ol the negative tip is approximately 1/16 of an inch below the center of the positive carbon tip, to know that you are correct, insofar as has to do with the alignment of the carbons. CRATER DISTANCE.— In installing the positive carbon it is essential that its tip be exactly the correct distance from the mirror. This correct distance is Ay2" from the center face of the mirror in the case where the spherical mirror is used and 4" in the case where the new "Elflex" or elliptical mirror is used. Practically all Powerlite lamps are now equipped with the "Elflex" reflector and the carbon stop studs now used on