F. H. Richardson's bluebook of projection (1935)

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1935
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
000624
Language:
English
Subjects:
Motion Pictures, Motion Picture Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
{"Media History Digital Library","Jeff Joseph"}
Coordinator:
Media History Digital Library
Description:
Date Added:
August 01, 2024
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606 RICHARDSON'S BLUEBOOK OF PROJECTION the speed is regulated primarily by the motor itself and by the induction machine (a. c. generator) mounted on the same shaft. The control cabinet apparatus merely assists in the action. The motor of Figure 148 contains a stator consisting of the windings designated in the drawing as F-l. The speed control field is composed of windings F-2. Driving H.& H 3939 TUMBLER SWITCH MOV. 60 CYCLES O 2090-A H.8.H. SNAP SW KS-6457 RHEO, Rt VAR. jH <j>REG. O-j 169-C COND R2 Ra KS-6619 RESIS INDUCTION MACHINE Fig. 148. — Schematic circuit drawing of motor speed control cabinet without vacuum tubes. current is not led directly into the armature through the brushes. Voltage is induced in the armature by the a. c. flowing in F-l. The four short-circuited brushes shown in the drawing close the armature circuits and permit current to flow in the armature coils. When Switch D-2 of the control cabinet (left center of the drawing) is thrown to "Regulate" the induction machine is connected in series with F-2 through R-2 and R-3, and the large condenser, C-l. If the motor runs too fast the current generated by the induction machine reinforces the current through F-2, causing the motor speed to decline. When the motor runs slow the current