Description: SHOWS WORK DONE IN WOOD-TESTING LABORATORIES EXPLORES THE FORMATION OF CHARACTERISTICS IN THE TREE AND THE PROPERTIES OF WOOD, THE LABORATORY TESTS UPON WHICH GRADING RULES ARE BASED. THE WORK OF THE LUMBER GRADER AND CLASSIFIES LUMBER GRADES ON THE BASIS OF USE. CONSTRUCTION. PIECES OF WOOD. PIONEER BLOCK HOUSE. SUBURBIA UNDER CONSTRUCTION. BUILDING HOUSES LOWERING ROOF FRAME FROM CRANE. RAILROAD TIES, TRAIN GOES OVER. FERRY PULLS INTO DOCK. PLANE LANDS ON AIRCRAFT CARRIER. WOMAN DIVES OFF DIVING BOARD. CELL STRUCTURE OF WOOD. USING PLANE TO EVEN OUT WOOD. SMOOTH IT. TREES IN FOREST. WEST COAST FOREST. WOODPECKER. POINT OUT TINY PINE SEEDLING. DENSE GROWTH. OVERCROWDING. CUT STUMPS. TALL TREES SWAY IN WIND. PAN DOWN TALL TRUNK. CU BARK. SCAR ON BARK. FUNGI. HARVESTING TREES FOR THE SAWMILL. CUT INTO LUMBER. INSPECTING LUMBER. GRADING. LOADING WOOD FOR SHIPMENT. GRADING STAMPED ON BOARDS. DIFFERENT GRAINS. FLAT GRAIN, VERTICAL GRAIN. FLOORING. SIDING. PAINTING ON VARNISH AND PAINT ON TRIM. LAB TESTS OF WOOD. STRENGTH AND STIFFNESS. TESTING A TWO BY EIGHT. KNOTS IN WOOD. MEASUREMENT DIAL. MAN PRESSES BUTTON ON MACHINE. CU PRESSES RED STOP BUTTON. SCALE GOES UP AND UP. SMALLER PRECISION TESTING MACHINE. WRITES ON CLIPBOARD. GRAPH RECORDS MEASUREMENTS. ENGINEER WITH SLIDE RULE DATA. ARCHITECTS DRAFTING PLANS. AT DESK WITH BLUEPRINTS. BUILDING SITES. BUILDING A HOUSE. CU OF WOOD CHARACTERISTICS. FRAMING A HOUSE. RAFTERS. CARPENTER HAMMERS NAILS. SUB-WALL. MEN ON ROOF. LARGE BUILDING BEING BUILT. BUILDING DOCK. LITTLE BOY HAMMERS NAILS INTO WOOD. BOYS SAW WOOD AND MAKE A TREE HOUSE. BUILDING CURVED ARCHES. FRAMING AN ARCHED ROOF. SNOW-COVERED MOUNTAIN, FOREST.
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