F. H. Richardson's bluebook of projection (1942)

Page scan 00083 from F. H. Richardson's bluebook of projection

Record Details:

Title:
F. H. Richardson's bluebook of projection
Date:
1942
Publisher:
New York : Quigley Publishing Company, Inc.
Volume:
F. H. Richardson's bluebook of projection
Leaf #:
00083
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
Date Added:
May 02, 2025
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ELECTRICAL APPARATUS COMPONENTS of heat. Many of the moulded compounds used i^v insulating apparatus and components melt or crack. Over loading wires and apparatus is dangerous to insulation as well as to conductors, and must always be avoided. 5. Conduit (29) With very few exceptions, all electrical wiring between units of projection room apparatus, or between such units and the power source, is protected by some form of conduit. This is required by safety regulations. The object of the conduit is to protect the wires against mechanical injury which may tear either them or their insulation, with possibility of a resulting flash-over of current that may start a lire. (30) The commonest form of conduit is metal pipe, ranging in diameter from l/2 inch up to almost any size required. The diameter used is governed by the diameter and number of wires to be carried in the conduit. It is always desirable to install oversize conduit, so that additional wires can be pulled in for future needs. In installation, corners may be negotiated either by bending the pipe or by use of suitable fittings. Fittings are also Figure 14 used at points where it is desired to have the wires enter or leave the conduit. It is advisable to install a surplus of fittings of the latter type for convenience in making future changes or connections.