Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 632
much 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 vamisb.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… … 022 ETCHING. When tho touching staff is dry, mis some thin turpentine varnish, slightly colored with lamp-black, andwith :i larger brush go ovor the whole of the plate. When tins last varnish is set. pom- on some very weak acid and water—tho former washings of theplate will do. With the soft…
Mechanical engineering
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