Richardson's handbook of projection (1927)

Page scan 000125 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 #:
000125
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 575 choke coil, with eleven or more taps taken off at certain points along th| winding. These taps are connected to an equal number of contacts of the dial switch, Fig. 184, so that the alternating current can be choked back or reduced to a value just sufficient to give the desired amperage at the arc. Fig. 187 is a diagram of the connections of the General Electric mercury arc rectifier; all parts of the rectifier are shown diagrammatically without reference to their actual Storting Anode Reloy Storting Anode ffe/oy /fesis ) Series Under loxf C.C Re/oy Lomp^ Figure 187. position with relation to one another when mounted on the rectifier, the idea being merely to illustrate the method employed in starting. It will be seen that three coils are used for starting, viz.: A shaking magnet, a series underload relay and a starting anode relay, the latter, which is normally open, but picks up when the carbons of the lamp are brought together, thus closing the shaking magnet circuit