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.
The gradual mixing or diffusing of one liquid into the other when placed in contact with each other.
(See Paper, Litmus.)
A Metric measure of volume.
The term which signifies that the distance between the lens and sensitive plate is greater for a particular size negative than a lens of short focus. Such a lens embraces a narrow angle. (See Angle of View.)
A process of color work named after the inventors; also called the AUTOCHROME PROCESS.
(See Silver Nitrate.)
Photographing the surface of the moon.
Various methods- of photographing machinery are taken up in the text. The following formula produces an excellent paint for dulling bright surfaces:
White Lead (dry).................. | 2 1/2 lbs. |
Lampblack................................................ | 1 to 3 ozs. |
God Size................................................... | 1/2 pt. |
Turpentine................................................. | 3/4 pt. |
The amount of lampblack used depends upon the subject as well as the lighting. Apply the paint in the ordinary manner.
After the exposure is made the paint may be removed with waste or rags saturated in turpentine.
(See Camera, Magazine.)
(See Optical Lantern.)
Mg
Lustrous, silver-white, malleable, moderately hard metal; burns with brilliant white light. Used in powder form for artificial illumination.
MgCl2 + 6H2O.
Colorless, deliquescent, bitter crystals. Soluble in water; partly soluble in alcohol. Keep in well stoppered bottle. Used, sometimes in the manufacture of gelatino-chloride crystals.
A lamp specially constructed for the igniting of magnesium powder for artificial illumination. Extreme care must be taken not to place flashlight compounds in a lamp of this kind, as a dangerous explosion will result.
Mgl2 + 8H2O.
Deliquescent, crystal powder. Decomposes in solution. Occasionally used in collodion.
An artificial light produced by burning magnesium ribbon or powder. Rich chemical rays.
MgSO4 + 7H2O. Epsom Salts; or Bitter Salt.
Small, colorless, prismatic crystals; odorless; bitter, saline taste. Soluble in 1.5 parts cold water, 0.3 parts boiling water; insoluble in alcohol. Its principal photographic use is as a constituent of flashlight compounds.
 
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