. Annual report of the Trustees of the State Museum of Natural History for the year ... Science; Museums. State Museum of Natural History. 93 to ten inches thick, should first be laid down, and the kimber piled on them in tiers, with narrow sticks between each board at the ends and centers. G-rass and weeds should not be allowed to grow near the piles of lumber, impeding the circulation of air under them. Large timber should be seasoned under sheds and not exposed to the rays of the sun, as the latter dries an exterior portion so raj)idly that it prevents the proper escape of moisture from the
. Annual report of the Trustees of the State Museum of Natural History for the year ... Science; Museums. State Museum of Natural History. 93 to ten inches thick, should first be laid down, and the kimber piled on them in tiers, with narrow sticks between each board at the ends and centers. G-rass and weeds should not be allowed to grow near the piles of lumber, impeding the circulation of air under them. Large timber should be seasoned under sheds and not exposed to the rays of the sun, as the latter dries an exterior portion so raj)idly that it prevents the proper escape of moisture from the outside, and internal decay is liable to occur. If timber, ties or boards are piled in close contact, and remain so for any length of time, dampness will revive and start the growth of mycelium. It is not uncommon to see large sticks of timber, especially for freight cars, taken into the shops partially covered by mycelium, dressed, framed, put into cars and then painted, thus com- pleting the essential condition for slow but certain decay. Such wood has only one-fourth to one-third the life of seasoned wood. Boards, especially those used for sheathing freight cars, when piled in close contact, in summer, are attacked in a short time by fungi, which discolor the wood by filling the cells with growths, often similar to those shown in Fig. IV. The species of fungi which discolor the sap- wood and then set up fermentations are ex- ceedingly numerous and grow with great rapidity. Some of the forms found in white pine are spheres re- sembling those shown in Fig. IV. This wood, on being dried, will remain dis- colored, but the sea- soning will check the decay. Such boards, when put into cars and painted, quickly decay when moisture reaches the unpainted surface. This class of decay is. Fig. IV. Magnified 150 diameters, showing fungus growths discoloring the sap-wood of white Please note that these images are extracted from scanned page images that may have been digitally enha
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Keywords: ., bookcentury1800, bookdeca, booksubjectmuseums, booksubjectscience
