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 Oxalates, Test for.)
(See Silver Salts, Test for.)
(See Sodium Hyposulphite, Test for Presence of.)
(See Sulphite, Test for.)
(See Paper, Test.)
(See Water Test.)
(See Lens Tests.)
A thermometer used in Europe, but little in America. A space between freezing and boiling point is divided into one hundred parts, the former being marked at zero, while the latter point is one hundred degrees. To convert Centigrade to Fahrenheit (the latter being used in America) it is necessary to multiply by 9, divide by 5, and add 32.
The standard measure of temperature in the United States. The freezing point is 32 degrees. The boiling point of water 212 degrees, which leaves 180 degrees between these two points. In the Centigrade thermometer (See Thermometer, Centigrade) this space is divided into 100 degrees. To reduce Fahrenheit degrees to Centigrade, subtract 32, multiply by 5, and divide by 9.
A thermometer scale in which the freezing point is marked o° and the boiling point 8o°. To reduce Reaumur degrees to Fahrenheit, multiply by 9, divide by 4, and add 32. To reduce Reaumur degrees to Centigrade, multiply by 5 and divide by 4.
(See Sodium, Hyposulphite.)
Three-Color Gum Process - VIII.
(See Color Photography.)
(See Tripod Head, Tilting.)
(See Factorial Development.)
The different degrees of light and shade in a picture. When the various colors in the subject have been truthfully rendered in monochrome in the photograph, and the effect of distance and atmosphere is natural, the photograph is said to have correct tonal values.
The surface color of a finished print.
(See Temporary Support.)
A substance is translucent when it allows the rays of light to pass through it, yet the substance is sufficiently opaque so that objects are not visible through it.