Servicing projection equipment (1932)

Page scan 000106 from Servicing projection equipment

Record Details:

Title:
Servicing projection equipment
Date:
1932
Publisher:
New York : Mancall Publishing Corp.
Volume:
Servicing projection equipment
Leaf #:
000106
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 15, 2024
Something wrong or inaccurate about this page? Let us Know!

Thanks for helping us continually improve the quality of the Lantern search engine for all of our users! We have millions of scanned pages, so user reports are incredibly helpful for us to identify places where we can improve and update the metadata.

Please describe the issue below, and click "Submit" to send your comments to our team! If you'd prefer, you can also send us an email to mhdl@commarts.wisc.edu with your comments.




We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.

Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.

90 SPARKING (f ) — The following are some very common reasons for sparking: — poor contact; a weak tension spring; poor "pigtail" contact; brush sticks in its holder; brush is at a wrong angle; brush is not rounded to the commutator ; the insulation of one of the bars is too high. The remedies for these are obvious. (g) — Loss of temper in the tension spring prevents it from making the tension strong enough. See if it is carrying more than its share of the current. If the tension spring seems overheated, provide some form of a jumper to help carry the current. This should be done when installing the next spring, unless a larger size or a heavier wire can be installed in the holder. (h) — The commutator may be worn thin. If it is, it will be necessary to replace it with a new one. (i) — The commutator mica segment is either too high or too low. Note if a click is heard as the brush is met. Locate the offending member, and while it is safest to send it away for correction, if the segment is high you may be able to readjust it by placing a small block of wood upon it and lightly tapping the wood with a hammer. (j) — The commutator may be roughened badly. If the fault lies in the materials, return it to the maker. If it is due to careless brush tension, inattention to the leveling of the set, etc., correct it as