Kidder, Frank E. (Frank Eugene), 1859-1905, Nolan, Thomas, 1857-1926 · New York : W.T. Comstock · leaf 15
that a sharply-defined line occursonly where the spring wood abuts against the summer wood of itsinner neighbor. It is this clearly-defined line which enables the eyeto distinguish even the very narrow rings in old pines and spruces. In a pine board, sawed from near the centre of the log, the… … sw spw Fig. 3.—Board of Pine. CS^ cross section; /?5, radial sec-tion; TS, tangential section; *iy, summer wood; j/iw,spring wood. BUILDING AND FINISHING WOODS. 13 aniform thickness, the spring and summer wood would appear onthe face of the board as parallel bands, but, owing to the irregularityof…
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