This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
(See Water, Distilled.)
A defect which will occur when photographing objects having perpendicular lines, if the camera is tilted upward and the ground-glass is not kept parallel to the subject; also an optical defect consisting of the curving of straight lines, which occurs with a single lens.
An optical term denoting the departing or receding of lines from each other.
(See Negatives, Doctoring.)
As comparatively few negatives are perfect, it is often necessary to hold back certain portions while printing. For example; a hard, contrasty negative with almost opaque highlights and clear shadows can be greatly improved by holding back the printing of the shadows. This is called dodging.
(See Lens Convex, Double.)
(See Exposure, Double.)
(See Extension, Double.)
(See Image, Double.)
(See Mounting, Double.)
A plate-holder which will hold two plates. (See Plate-Holders.)
(See Combination Printing.)
(See Lens, Doublet.)
A small weight, being 1/8 of an ounce in apothecaries' weight, or 1/16 of an ounce in avoirdupois weight; also 1/8 of an ounce fluid measure.
A resin so named because of its red color. Very opaque and brittle, tasteless and without odor. Dissolves in alcohol or ether. Used in the preparation of varnishes.
Rack made of wood on which to drain dry plates; also racks placed in sinks on which to rest trays, etc.
A special, tough paper, obtainable at stationery stores. Often used as a base for the Kallitype and other home-sensitizing processes.
(See Bottle, Dropping.)
(See Shutters, Drop.)
(See Distillation, Destructive.)
(See Mounting, Dry.)
(See Mounting Tissue, Dry.)
Plates of glass coated with an emulsion composed of gelatin and sensitive silver salts.
(See Negatives, Drying.)
(See Lens, Dynar.)
A reducing solution composed of chloride of lime and potassium carbonate. Used for eliminating sodium hyposulphite from negatives or prints after fixing. It is also a stain remover and a reducer. It may be prepared as follows:
Potassium Carbonate....................................... | 2 ozs. |
Chloride of Lime (dry).................................... | 1 oz. |
Water ................................ | 20 ozs. |
Mix the chloride of lime with 15 ounces of water and dissolve the potassium carbonate with the remainder. Then mix the two solutions. Boil and afterwards filter. When cool it is ready for use.
 
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