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 #:
000119
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 18, 2024
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MANAGERS AND PROJECTIONISTS 509 means for connecting the anto-transformer directly to the arc, and, (G) a bulb and its holder. The reactance coil is for the purpose of steadying the arc. and limiting the current when the carbons are brought together when striking an arc, which is a dead short circuit to a value which will not be injurious to the bulb. Modern rectifiers are so equipped that in case the bulb gives out the projectionist can switch over to the autotransformer and continue the show with alternating current, using the auto-transformer as an economizer. Also modern rectifiers are equipped with a dial switch by means of which the projectionist may instantly vary the voltage, thus varying the amperage within the minimum and maximum capacity of the bulb. INSTALLATION. — Rectifiers are ordinarily received in two separate shipments, one of which, the rectifier itself, weighing several hundred pounds, will probably come by freight. The other, the glass bulb, carefully packed in a specially made case, is usually sent by express. In removing the bulb from its crate proceed strictly according to directions in loosening the crate, after which carefully lift out the bulb. It will be in an inverted p o s i ti o n. Turn it slowly over and carefully let the mercury run down into terminals B, C. In rolling, the mercury should make a sharp, cracking sound, which is an indication that the tube is in good condition. The rectifier should not be located directly in the projection room, unless there be some means provided for covering the bulb so that its light will not shine in the room. Light in the projection room is highly objectionable. One very good Figure 183.