San Francisco : Architect and Engineer, Inc · leaf 190
LEFT; FLAT GRAIN WESTERN RED CEDAR SHOWING ITSINTERESTING PATTERN AND THE SHARP CONTRAST BE-TWEEN THE NARROW DARK SUMMERWOOD AND THELIGHT SPRINGWOOD IN THE ANNULAR GROWTH RING RIGHT: VERTICAL GRAIN WESTERN RED CEDAR SHOWINGTHE NATURAL CLEARNESS AND FINE, EVEN GRAIN CHAR-ACTERISTIC OF THIS WOOD … CROSS SECTION OF RED CEDAR SHINGLE SHOWINGAIR-FILLED HEAT INSULATING CELLS—THERE ARE SEVERALMILLION IN EVERY CUBIC INCH OF WESTERN RED CEDARWOOD. DARK HORIZONTAL LINES ARE WOOD RAYS THATREINFORCE AGAINST SPLITTING. VERTICAL DARK LINESMARK THE LIMITS OF ONE ANNUAL RING, MAGNIFIED 40TIMES
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