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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) (14760206286).jpg

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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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f an apparatusactually in operation in our own works. Instead of working two horizontal stones in theopen air, we keep them in a tight inclosure. Thelower stone is steady, whereas the upper one re-volves and receives its motion from a vertical shaftpassing through the middle of the lower stone, andfixed to a three-branched rynd in the upper one. Acopper cover screwed upon the casing of the stones,supports the distributor of white lead. This distri-butor is made of two truncated cones, one of which,the exterior, is bolted upon the copper cover. Theinterior one is fixed to a vertical revolving shaft.Both cones are cast with grooves in opposite direc-tions. The lumps of white lead are first reduced in sizein the distributor, then finely powdered between thestones, and lastly, sifted in sieves kept in hermeticallyclosed boxes. Fig. 26 is a vertical section of the apparatuspassing through the line a b c d (Fig. 27). Fig. 27 is a horizontal section passing throughthe line e f g h (Fig. 26).
Text Appearing After Image:
WHITE COLORS. 143Fig. 28. Fi2. 30. Fig. 30 is the distributor on a larger scale. This distributor is made of cast-iron and is linedinside with a bronze casting filled with grooves.Another grooved cone A revolves inside, andbreaks the lumps or blocks of white leadinto small fragments, which fall betweenthe stones G k. B, vertical iron shaft, fixed to the smalldistributing cone, and rising up to thecapital c, on top of which there is a screw

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Riffault des Hêtres, Jean René Denis, 1754?-1826; Vergnaud, A. D. (Armand Denis), 1791-1885; Toussaint, G. Alvar;

Malepeyre, F. (François), 1794-1877
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30 July 2014
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