Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 624
h ivory -black as will make the mixture a darkcolor, by the addition of a small quantity of sheeps or ox gall; it works almost as free as the varnish.Make the composition to a lump. A small quantity to be used with water when required. Again lay the plate for work. Paint over all the parts that are… … 022 ETCHING. When the touching stuff is dry, mix some thin turpentine varnish, slightly colored with lamp-black, and■with a larger brush go over the whole of the plate. When this last varnish is set, pour on some very weak acid and water—the former washings of theplate will do. With the soft…
Mechanical engineering · Mechanics · Engineering
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