Richardson's handbook of projection (1927)

Record Details:

Title:
Richardson's handbook of projection
Date:
1927
Publisher:
New York : Chalmers Publishing Company
Volume:
Richardson's handbook of projection
Leaf #:
000153
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 603 magnetic reactance will be set up, which will have the effect of offering resistance to current flow. This is also called "magnetic kick." The magnetic field set up around the core of the coil has the effect of creating a counter E. M. F., which opposes the line voltage and reduces it. The practical effect upon current flow is essentially the same as that of the rheostat, but the choke coil is very much more economical in operation than is the rheostat, though it is not nearly so satisfactory for the produc Figure 201. tion of projection light as is the transformer or auto transformer, or even the rheostat, largely by reason of the fact that it has a tendency to produce flaming at the carbons; also projection light from an arc supplied by a choke coil usually has a harsh, bluish, very unpleasing tone. TWO WIRE TO THREE WIRE. — Transformers may be built to take current from a two wire supply and deliver to a three-wire system, as per Fig. 202. MULTIPLE CONNECTION. — Projection transformers of the same voltage and cycle rating may be connected in multiple in order to increase the amperage at the arc. To accom AM AM /to T //O + sao Figure 202.