. Matériaux de peinture et de peinture: Un livre de faits pour les peintres et ceux qui utilisent ou traitent des matériaux de peinture . puissance de rable. Les puissances inférieures montrent de longues lignes de crêtes correspondant aux vallées entre deux fibres. Ceux-ci sont fortement marqués; beaucoup moins fortement marqués sont d'autres ridgescroisant la surface de la peinture, et correspondant aux lignes entre, ou sur, les rayons médullaires courts (c. c.hg. 2). Avec des verres plus puissants, et regard plus profond dans la surface de la peinture, des moules de cellules de bois individ-ual (c. fig. i) sont vus, et l'empreinte de leur surface. Tous ces lin

• Contributeur: Reading Room 2020 / Alamy Banque D'Images
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• Dimensions: 1440 x 1735 px | 24,4 x 29,4 cm | 9,6 x 11,6 inches | 150dpi

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. Painting and painters' materials: a book of facts for painters and those who use or deal in paint materials . rable power. The lower powers willshow long lines of ridges corresponding with the val-leys between two fibres. These are strongly marked;much less strongly marked are other very slight ridgescrossing the surface of the paint, and correspondingto lines between, or on, the short medullary rays (c. c.hg. 2). With more powerful glasses, and lookingdeeper into the surface of the paint, molds of individ-ual wood cells (c. c. fig. i) are seen, and the imprintof their surface. All these lines and ridges tend inone direction (except those corresponding to themedullary rays), and this direction is z£////^ the grain ofthe wood. Any strain or movement of particles will. Priming Wood. jj therefore, tend to accumulate on this line, which willopen cracks across the grain. The attachment to thepaint is to the particles of the wood-stuff, as is shownby the adherence of certain portions after the painthas been soaked off. It is also held fast by beingjammed into such valleys as we have described; but. since oil contracts in drying, this hold is only occa-sionally a strong one. To protect the paint we must protect the wood par-ticles to which it is attached. We can best do this byfilling the cells to which the wood holds ; a thin oilwill soak their surface, but it is difficult to fill them.I have accomplished it with varnish, subjecting thesurface to very strong heat for many days. The var-nish does not then soak loose because the water does 54 Painting and Painters Materials. not reach the particles on the wood surface, to whichthe surface of varnish holds. P7iming.—The object of priming is to prevent thesurface cells of the wood from being softened by water, or to protect the surface cells of wood immediatelyunder the paint from water coming at them from below.For this reason a priming coat should be thinenough to enter into the ^Cox^-stuff, and surroundthose particles

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• bookcentury1800
• bookdecade1880
• bookpublishernewyo
• bookyear1883