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 #:
000536
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:
September 28, 2023
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.

438 HANDBOOK OF PROJECTION FOR plan of which is diagrammatically outlined in Fig. 143, in which only the layout of the electrical parts, is illustrated, with the casing, supporting frame, etc., omitted. In the diagram, A and B are the main binding posts of the rheostat. C and D are two copper bus bars. E E E E are switches, which may be either single pole knife-switches, or a dial switch. Line G merely represents the slab of insulating material which supports the switches. F F F F are conductors which connect one terminal of switches E E E E with bus bar D. The four straight lines, 5, 6, 7 and 8, connecting the right hand end of bus bars C and D, each represent a single coil of resistance wire having a capacity of, in this instance, 10 amperes. In this particular d i agram, these four coils represent the fixed resistance offered by the rheostat when switches E E E E a r e open. The next three lines, 2, 3 and 4, represent 10 ampere coils, each of which connect with one of the binding posts of a switch, as shown. With these three switches closed, the rheostat would deliver 40+ 30=70 amperes. The next line, 1, represents a 5-ampere resistance coil, which also connects to a switch. With all four of the switches closed the rheostat would deliver 40+30+5= 75 amperes. The advantage of the 5-ampere coil is that by its manipulation the rheostat would deliver anything from 40 amperes to its capacity, in 5 ampere steps. Figure 145.