. Appleton's dictionary of machines, mechanics, engine-work, and engineering. pines, which may be intended for the better attachment of the bark to thestem, but, from their comparative minuteness, they produce no such effect on the wood as that whichexists, we believe exclusively, in the birds-eye maple. This led me to conclude that in woods, the figures of which resemble the undulations, or the ripple-marks on the sands, that frequently occur in satin-wood and sycamore, less frequently in boxwood, andalso in mahogany, ash, elm, and other woods, to be due to a cause explained by Fig. 3936, nam
. Appleton's dictionary of machines, mechanics, engine-work, and engineering. pines, which may be intended for the better attachment of the bark to thestem, but, from their comparative minuteness, they produce no such effect on the wood as that whichexists, we believe exclusively, in the birds-eye maple. This led me to conclude that in woods, the figures of which resemble the undulations, or the ripple-marks on the sands, that frequently occur in satin-wood and sycamore, less frequently in boxwood, andalso in mahogany, ash, elm, and other woods, to be due to a cause explained by Fig. 3936, namely, aserpentine or guilloche form in the grain: and on inspection, the fibres of all such pieces will be foundto be wavy, on the face, at right angles to that on which the ripple is observed, if not on both parts of the wood which happen to receive the light appear the brightest, and form the ascendingsides of the ripple, just as some of the medallic engravings appear in cameo or in intaglio, according t«the direction in which the light falls upon them. The woods possessing this wavy character generally split with an undulating fracture, the ridgesbeing commonly at right angles to the axis of the tree, or square across the board; but in a specimenof an Indian red wood, the native name of which is Caliatour, the ridges are inclined at a considerableangle, presenting a very peculiar appearance, seen as usual on the polished surface. In those woods which possess in abundance the septa or silver grain, described by the botanist as themedullary plates or rays, the representations of which, as regards the beech-tree, are given in Fig. 3930,another source of ornament exists; namely, a peculiar damask or dappled effect, somewhat analo-gous to that artificially produced on damasked linens, moreen^, silks, and other fabrics, the patternson which result from certain masses of the threads on the face of the cloth running lengthways, andother groups crossways. This effe
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Keywords: ., bookcentury1800, booksubjectmechanicalengineering, bookyear1861
