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 #:
000303
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:
March 21, 2024
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CURRENT RECTIFICATION 285 for use with two tubes instead of one. The plates of the tubes are connected to opposite ends of the plate secondary, hence A plate will be positive (and carrying cur FlGURE 74C rent) when B plate is negative, and vice versa. The lower secondary of the transformer lights the filaments, and also serves as part of the conducting path for the circuit originating in the upper secondary. Electrons flow from either filament to the plate that is positive at the moment, thence to the center-tap of the plate secondary, thence through the projection arc, thence to the center-tap of the filament secondary, and thence back to the filament from which they were emitted. The current through the arc is always in one direction, but drops to zero twice in each cycle, at those moments when the charge on one plate is just changing from positive to negative while the charge on the other is just changing from negative to positive. The pulsations in d.c. output are, however, much less than in the case of Fig. 74 A. in which no current at all flows through the arc during a full half of each cycle. (38 The difference is diagrammatically illustrated in Fig. 74C in which A represents the "full wave" a. c. wave and B the portion