F. H. Richardson's bluebook of projection (1942)

Page scan 000392 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1942
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000392
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:
July 11, 2024
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376 RICHARDSON'S BLUEBOOK OF PROJECTION tensity arc with which a glass condenser is used to collect and converge the light. (58) It is by far the most powerful light source used in motion picture projection, running as high as 800 candle power per square millimeter area of light source area. (59) When properly handled the 13.6 mm trim working at 125 amperes should drop very little below 750 candle power per sq. mm. of light source area. (60) The light source is very sensitive to faults. Light production falls off rapidly with faulty adjustment or handling. (61) Under proper conditions using a 13.6 mm carbon trim, the arc will produce a total illumination of approximately 19,000 candle power at 70 amperes. At 100 amperes this is increased to about 40,000 c. p. and at 120 amperes to about 63,000 c. p. These figures represent the total light production. They are quoted merely to convey some idea of the effect of amperage, the rise in brilliancy being fairly steady from 70 to 120 amperes. 40000 1 1 1 1 CANDLf POWEI I OF CRATE* VS. j LIGHT 1 &MVI, /' I36MM y '' 40000 9MM. -< 0 —--^ ^o e 0 o e c ? o < < .UR(?EN 0 T 0 1 X> i. 10 "« 0 -60 Fig. 148. — Graph shows the candle power of light production compared with the flow of current. (62) Fig. 149 illustrates a correct high intensity arc adjustment. (63) It is unsafe to be guided wholly by arc voltage in handling the high intensity arc. (64) The light itself is presumed to emanate from the chemicalized