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

Page scan 00093 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 #:
00093
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
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.

ELECTRICAL CONDUCTORS 75 any 3-wire circuit is unbalanced by connecting an am meter to each side successively, or by connecting it to the neutral wire between the first piece of current-consuming apparatus and the switchboard. 3-Wire System Wire Sizes (49) To calculate wire sizes suitable for 3-wire systems, proceed as for ordinary 2-wire circuits, giving consideration only to the true negative and true positive — the outside wires. Having determined the necessary size for the outside wires, install a neutral of the same diameter. Switches (50) In Fig. 19 we see, at the top, what is known as a single-pole, single-throw knife-switch. It is a single-throw for the reason that it can make but one Figure 19 contact, namely with the copper spring clip, C. At the other end the "knife" or "blade" is permanently attached to clip D. The circuit wires are attached to lugs EE. The base upon which the parts are mounted is made of insulating material. When knife A is pulled out of clip C, the line is broken and all current flow is stopped. SPST is the recognized abbreviation of this type of switch. (51) Immediately beneath this we see a single pole, double throw SPDT switch. It is exactly like the one above except that at the left is a second copper spring clip with which the switch blade can make contact. This type