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 #:
000428
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.

334 THE ADVANCE OF PHOTOGRAPHY The lens LY is situated inside the tube B, fig. 145, and its position can be regulated by means of the small knob 8. When the adjustments are being made this knob should be moved until an image of the diaphragm is formed at E, midway above the upper face of the prism P, which itself can be adjusted by means of the milled head B (fig. 145). It is of extreme importance that the width of the pencil of light proceeding from the prism P may be properly regulated ; this may be done by altering the distance of P from Lv This distance should be greater Fig. 146. with high than with low powers. P is also of extreme importance, because it can be so arranged as to intercept any light reflected by the lens L} which, if allowed to pass through the second prism P2 would cause irregularity of illumination of the screen. After the light has passed through P it proceeds through the objective 0 and illuminates the object ; it then returns through the objective 0, enters the prism Plt and is by this deflected into the camera. Should it be necessary to adjust the prism Pl9 this can be done by means of the pin n (fig. 145). Both this pin and the milled head R are provided with index marks, so that the prisms can always be reset in the same initial positions.