Early Work In Photography
A Text-book For Beginners
Forfatter: W. Ethelbert Henry C. E., H. Snowden Ward
År: 1900
Forlag: Dawbarn and Ward, Limited
Sted: London
Udgave: 2
Sider: 103
UDK: IB 77.02/05 Hen
Illustrated with an actual negative and positive, and numerous
explanatory diagrams throughout the text
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CHAPTER X.
DEVELOPMENT OF NEGATIVES.
Causes and Cure of Failures.
stated in a previous chapter, we prefer the hydro-
AS quinone developer for most subjects, and we give
1 herewith a slightly modified formula suited to nearly
J all classes of subject. . The modification consists
merely of an extra solution forming an alternative accelerato
for special subjects where excessive density is required. 1.
aSstage if will be well for the student to prepare his
alii ic F hit Ue rem ea that Mpecihe
directions asto the order of mixingare of decided importance
and minstinctif a formula directs separate solutions of
rm
absurdities are often perpetrated, and the
formula is blamed. he borne in mind is the different values
CAR thanks to the absurdity of the British system
of weights usedt sold by avoirdupois weight (4374 grains [16
all chemicals are so photographic formulæ are usually com-
drams] = I oz.), but ph OtoT (480 grains [8 drams] = I oz.)
pounded byrapcthocaise our formulae in grains (or parts)
------
ridicule directed town aie of developer suitable for all
classess of work. The ounces in the case of liquids are, of
course, fluid ounces.