By Harry Jenkins
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Additional resources for A Manual of Photo-Engraving
MANUAL OF PHOTO-ENGRAVING. 22 Rubber cement. Calcium chloride. Mercuric chloride. Ammonium Transfer etching ink. Lye. Dragon's blood. chloride. Acetic acid. ). Nitric acid (C. ). Sodium bicarbonate. Absorbent cotton. Charcoal blocks. Chromic acid. Copper sulphate. Ordinary charcoal will not of polishing the metal. - answer the purpose The most suitable is that used by jewelers for soldering- purposes and obtained in blocks of about 3 by 4 inches. To is insure success most of the chemicals men- be chemically pure.
The routing- machine is the most important item department, and is used for deepening and cleaning out the spaces in zinc etchings, making a bevel around half-tones, etc. These machines can be obtained in various sizes according to the dimen- in this sions of plates to be routed. A circular saw is also an essential piece of machinery, for sawing metal plates, blocks, etc. The trimmer, as its name indicates, is used for trimming the edges of blocks after the plates are mounted. The shoot board is used for a similar purpose and is generally substituted for trimmer in small shops.
Soluble. The Anthony's prepare the collodion dissolve the gun cotton and six ounces of the alcohol. Then put the remaining two ounces of the alcohol in a clean mortar and add each salt separately, and grind with the pestle until dissolved. After all of in the ether HALF-TONE— 150-LINE SCREEN. MANUAL OF PHOTO-ENGRAVING. 35 the salts have been added and dissolved, pour the gun cotton and shake This collodion will usually be found to work well in a few hours after making but should it fail to work clearly add a few flakes of iodine to turn toward a red color.
A Manual of Photo-Engraving by Harry Jenkins