Richardson's handbook of projection (1930)

Record Details:

Title:
Richardson's handbook of projection
Date:
1930
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000309
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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MANAGERS AND PROJECTIONISTS 1233 AC BD 2 (cos 6 cos — — h sin 0 sin — ) oc . . oc 2 (cos 0 cos — sin 0 sin — ) oc cos 0 cos2 — cos2 0 cos2 — sin2 0 sin2 — Inverting and simplifying BD n sin2 0 , a: —r-^r = cos 0 — tan2 — AC cos 0 2 Now the maximum permissible amount of distortion is a matter on which there seems to be considerable range of opinion. Your committee feels that in recommending 5 per cent at the maximum permissible increase in picture height it is erring on the side of laxity rather than rigidity, and is particularly anxious to hear discussion of this matter by the Society. Proceeding for the moment on the basis of 5 per cent : sin2 6 oc cos 6 tan2 — = 0.9524 cos 6 2 and cos2 6 — sin2 6 tan2— = 0.9524 cos 6 cos2 0 tan2^* + cos2 6 tan2-^ = 0.9524 cos d sec2 -^cos2 6 0.9524 cos $ tan2-^ =0 This puts the equation in the quadratic form, and the solution for cosine 0 is of course cos 6 0.9524 ± xj 0.95242 + 4 sec2 — tan2— 2 sec2 —