File:A practical treatise on the manufacture of colors for painting - comprising the origin, definition, and classification of colors; the treatment of the raw materials etc. (1874) (14783194515).jpg

Identifier: practicaltreatis00riff (find matches)
Title: A practical treatise on the manufacture of colors for painting : comprising the origin, definition, and classification of colors; the treatment of the raw materials ... etc.
Year: 1874 (1870s)
Authors: Riffault des Hêtres, Jean René Denis, 1754?-1826 Vergnaud, A. D. (Armand Denis), 1791-1885 Toussaint, G. Alvar Malepeyre, F. (François), 1794-1877
Subjects: Paint
Publisher: Philadelphia : H. C. Baird
Contributing Library: Getty Research Institute
Digitizing Sponsor: Getty Research Institute

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rate of lead for theproduction of carbonate of lead; Fourth. In using litharge, massicot, or any protoxideof lead, boiled with nitric acid or nitrate of lead, andexposing the hot solution to the action of carbonicacid; Fifth. In condensing and purifying the carbonateof lead thus obtained by a simple, new, and economi-cal method. For these various operations we need: 1. A specialapparatus for the production of white lead by meansof litharge, massicot, or protoxide of lead, and thisapparatus is provided with a pair of forge bellows, asafety valve, and other accessories; 2. A cylindricalcast-iron furnace with a cover of the same material,which is held by a screw and luted with clay,in orderto prevent the access of the air; 3. A large cylindri-cal wrought-iron vessel which can be hermeticallyclosed, and which contains a diaphragm of metallicgauze and a stirrer. The air or gases circulatethrough a conduit of a spiral form, and escape aboveby a central opening; 4. A copper pump for removing
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WHITE COLORS. 117 the liquors from the various receivers, and forcing themupon cloth sieves disposed on top of other tanks; 5.Lastly, the other vessels, pipes, stopcocks, and acces-sories necessary for obtaining the gases, washing, andseparating the carbonate of lead. The following figures will explain the apparatus:In Fig. 18 A represents the bellows; b, the rod foroperating it; c, a weight necessary to overcome theresistance of the air introduced into the furnace; d,safety valve, and e the tuyere. F is the furnace composed of a cast-iron cylinder,stout enough for the purpose; a, cast-iron cover whichmay be removed at will; h\ clamp fastened to theedge of the furnace, and through which passes thescrew d which compresses the cover against the clayluting put between it and the cylinder. The flame passes through the cast-iron pipe g intothe cast-iron cylinder h i, called the flame receiver. K is a double-elbow pipe starting from the top ofH I, which can he cleaned of ashes and dust thro

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