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.
A room from which all actinic light has been excluded and in which the sensitive plates and papers are handled during the process of changing, developing and printing. For ordinary plates and papers the ruby light is sufficient, but for color sensitive materials, almost total darkness is required. A green light, however, is employed for plates which are sensitive to red, etc.
An English term for the plate-holder
The separation of a clear liquid from a precipitate deposit. Accomplished by gently inclining the graduate or allowing the liquid to run out without disturbing the precipitate at the bottom; also effected by means of a siphon.
A Metric measure of volume.
A Metric measure of length.
(See Light, Decomposition of.)
A Metric measure of weight.
A solid is said to deliquesce when it possesses the property of becoming soft or liquid by absorbing moisture from the air. Ex. Calcium Chloride.
Printing opacity of a negative.
(See Focus, Depth of.)
(See Printing, Depth of.)
(See Distillation, Destructive.)
A solution used to bring out and render visible the latent image in sensitive plates or papers.
The process of rendering an invisible latent image visible. Applied to any process and renders visible a photographic image.
An optical term denoting the change of the course of a ray of light when it is reflected or refracted from its direct course.
Whitish powder or transparent yellowish lumps. Soluble in water. Used as a substitute for gum arabic, also for making mountants.
A line drawn through the center of a circle terminating each way at the circumference. If the circumference of a circle is given and it is desired to find the diameter of it, divide the former by 3.1416, or multiply by .31831.