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 camera so arranged that a bed may be lowered or attached to both front and rear of the body of the camera, or a camera whose bed can be extended almost double its normal length. This gives approximately double the usual length of bellows and allows of extra long focus lenses being used.
A process of developing the photographic plate by noting the time of first appearance of the image and dividing this amount into the total time required to complete the development. This gives the developing factor for the developing formula. This factor may be employed at all times when using this particular formula, at the same temperature.
(See Thermometer, Fahrenheit.)
(See Front, Rising and Falling.)
(See Perspective, False.)
Ammonium-Citrate of Iron. Brownish-red glistening scales, or green scales - the latter is preferable for photographic purposes. Soluble in water; insoluble in alcohol. Used in the preparation of blue print paper.
Fe(NO3)3 + 18H2O. Iron Nitrate. Grayish-white crystals. Soluble in water. Used as a sensitizer in the various iron processes.
Fe2(C2O4)3. Iron Oxalate, Ferric.
Greenish-yellow scales or powder. Soluble in water. Ferro-Prussiate Process.
(See Blue-Print Process.)
A thin sheet of iron coated with black enamel. Used instead of glass to enamel gelatin prints. Also used for making tintypes.
FeC2O4 + 2H2O. Iron Oxalate, Ferrous. Pale-yellow, odorless, crystal. Soluble in cold hydrochloric and hot diluted sulphuric acids; practically insoluble in water. Used in conjunction with potassium chloro-platinite for coating platinum paper.
FeSO4 + 7H2O - II; V.
Large, bluish-green efflorescent crystals; odorless; saline astringent taste. Soluble in water; insoluble in alcohol. Used largely as a developer for wet plates, ferrotypes and in the ferrous oxalate developer for plates and bromide paper.