Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures (1914)

Record Details:

Title:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Date:
1914
Author:
Gage, Simon Henry, 1851-1946
Publisher:
Ithaca, N.Y. : Comstock Publishing Co.
Volume:
Optic projection : principles, installation and use of the magic lantern, projection microscope, reflecting lantern, moving picture machine, fully illustrated with plates and with over 400 text-figures
Leaf #:
000522
Language:
English
Format:
Books
Contributor:
Gerstein - University of Toronto
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
Bibliography: p. 693-703
Date Added:
July 19, 2022
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.

CH. XIII] POLARITY TESTS 507 the current and strike the arc. After the lamp has burned a minute or two open the switch or pull the separable plug apart and watch the ends of the carbons. The one that remains red-hot the longer is the positive one, and the wire leading to it is the positive B FIG. 271. SIDE AND FRONT VIEWS OF THE RIGHT-ANGLE CARBON ARC WITH CORRECT AND INCORRECT POLARITY. A The upper figures show the correct polarity, that is, with the positive crater on the upper carbon. B The lower figures show reversed polarity, that is, with the lower carbon positive and hence the large crater on it. The photographs were made with a color screen in order to bring out the positive and the negative craters with the greatest clearness. The exposure for the craters was instantaneous, then there was an additional exposure of 90 seconds without a color screen, and with an illumination from a mazda lamp to bring out the carbons and give the appearance seen by the human eye (see also fig. 292-293).