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.
Narrow-Angle Lens - III, 289. (See Angle, Narrow.)
The term applied to the metallic silver image on a glass plate or film in which the lights and darks of the original appear in reversed order. From the negative a positive may be printed, which again reverses the order of high-lights and shadows and gives a correct reproduction of the original. Negative Collodion. (See Collodion.)
(See Lens, Negative.)
(See Paper, Negative.)
Manipulating a negative either during development or before printing, so as to get better results on the print. When doctored just before printing the work is usually done on the back of the negative. Opaque and semi-opaque substances are employed to retard printing on certain parts, while ground-glass substitute is sometimes flowed on the glass side and this made transparent over sections that require deep printing, etc. Negatives, Drying - I; II.
The drying of negatives can be hastened by first draining the plate after washing, then placing them in alcohol or formalin for a minute, or less, then setting the negatives in a draft, where they will dry quickly.
Negatives in which the image is reversed with reference to right and left.
(See Acid Hydrofluoric.)
A trade name for papers manufactured by Eastman Kodak Co,
(See Ammonium Nitrate.)
(See Ferric Nitrate.)
(See Silver Nitrate.)
(See Uranium Nitrate.)
(See Acid Nitrate.)
An optical term designating, respectively, the points of admission and emission on the axis of the lens where all instant or emitted rays converge to a point.
A developer containing a very small percentage 5 grains to the ounce of solution - of iodide of potassium. This chemical acts in such a way as to keep the whites of the print clear and free from black lines or abrasion marks.
A term applied to the rays of light which have practically no chemical action upon sensitive substances.
A developer that is properly balanced; i. e., a developer that has not been modified in any way for under or over-exposure, but compounded for the treatment of a normally exposed plate.