F. H. Richardson's bluebook of projection (1935)

Page scan 000102 from F. H. Richardson's bluebook of projection

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 #:
000102
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:
August 01, 2024
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£4 RICHARDSON'S BLUEBOOK OF PROJECTION forms: link, cartridge and plug. (76) The link fuse is used in metal cabinets wherever local regulations require them for projection circuits because it is difficult to "boost" them without the trick being immediately evident upon inspection. Cartridge Fuses (77) A cartridge fuse consists of two brass or copper terminals joined by fuse wire inclosed in a paper barrel filled with a powdered non-inflammable insulating material. Inside this barrel, embedded in the Figure 23 • powder, is a pilot wire which is much smaller than the main fuse wire. It always passes immediately under a paper label pasted on the surface of the fuse barrel. The object of this is that when the main fuse wire melts the pilot will also melt, and in the process will scorch the paper label so that the melted fuse may be identified at once. This usually works out all right, but not always. An unburned label is not positive proof that a fuse is not blown. In Fig. 23 we see two forms of cartridge fuse contact, namely the ferrule A and the knife blade B, together with their receptacles. In Fig. 24 we have a view of the construction details of a cartridge fuse of ferrule contact type. The knife blade fuse is exactly the same, except for its contacts.' The drawing is self explanatory.