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 #:
000223
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
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DRY PLATES, FILMS AND PAPERS 173 ^^^r^^rr^^ required to darken a small section of sensitized paper to a fixed tint. When such a meter is used care must be taken to ensure that the exposure of the meter has been made at that place in which the densest shadows occur, otherwise the plate will almost certainly be under-exposed. The fig. (82) shows the appearance of a meter issued with Wellcome's Photographic Exposure Record ; the shaded portions are fixed permanently to the cover of the book, the un >^\\J§ shaded part can be rotated on the central axis. An illustration will make clear how this meter is intended to be used. Suppose the month to be January, the time 12 noon, and the sun to be shining brightly, then the light value from the given monthly tables is 1/3. FiS 82 Next, suppose the view to be taken includes a very heavy foreground. By placing the tips of the fingers on the movable part this can be rotated until very heavy foreground is just in line with 1/3, as in illustration. Again, if the plates used are Imperial Sovereign, then a reference to the speed table, Col. 1, gives 1/6 as factor for this brand. On looking at the meter, 1/6 (plate speed) will be seen to be opposite 1/8, and these figures, which in the actual meter are in red, indicate the time in seconds which a correct exposure should take when the stop used is //8. Exposure for stops ranging from //5*6 to //32 can also be read off direct without any calculation.