The advance of photography : its history and modern applications (1911)

Record Details:

Title:
The advance of photography : its history and modern applications
Date:
1911
Publisher:
London : K. Paul, Trench, Trübner & Co., Ltd.
Volume:
The advance of photography : its history and modern applications
Leaf #:
00071
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
November 02, 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.

THE CHEMICAL ACTION OF LIGHT 49 Egypt. When burning the magnesium wire, Solomon's lamp was used (fig. 15). This consists of a reel K, upon which the wire is coiled, a clockwork apparatus G, which conducts the wire from the reel between two rollers to the tube R, at the end (/) of which the wire is burned. The concave mirror 0 reflects the light in parallel rays. By means of the handle H, the lamp supplying parallel rays can be turned in any direction, and the clockwork can be instantly stopped by the key m. The duration of an ordinary magnesium flash extends over less than \ of a second, but effects which much more nearly approach to what may be considered as instantaneous (jq sec. or less) Fig 15 can be obtained by using the so-called magnesium flash powders. These powders are made by mixing with ordinary magnesium powder certain proportions of substances which are extremely rich in oxygen, and hence favour rapid combustion, or, in other words, explosion. Potassium chlorate is such a substance, and is one which is very frequently used for this purpose. Persons who make use of such powders as these should be very careful to mix them only immediately before using. The utmost care should also be taken to avoid any kind of D