FIGURE 6.-The wood railroad crosstie, in spite of numerous attempts to introduce substitutes, still has no equal in providing a durable but yielding surface for track support. FIGURE 7.-Factory-type building with tall, laminated, preservative-treated wood columns which support wood bowstring arches. plywood siding. Workmen are shown attaching bolic paraboloid). (i) Fallout shelters. (j) Boats. 2. Nonstructural uses: (a) Interior paneling. (b) Doors. (c) Movable partitions. (d) Exterior siding. (e) Floor underlayment. Finish flooring. (g) Cabinets, shelving, countertops, cases, etc. G. Building fiberboards and particle boards: 1. Fiberboards (a sheet material manufactured of refined or partially refined vegetable fibers, principally from wood): (a) Semirigid insulation boards: 85963 0-62 (1) Heat insulation in structures. (2) Sound insulation. (b) Rigid insulation boards: (1) Wall and roof sheathing. (2) Plaster base. (3) Roof decking. (4) Exterior paneling, siding, soffits. FIGURE 8.-A 1,750-foot bridge used in construction of Priest River Dan Glued laminated girders, 124 inches by 63% inches in cross section, are designe to carry 300 tons per span-two Euclid trucks or a diesel locomotive and o car. (5) Interior finish boards. (6) Acoustical tile. (1) Interior paneling. (2) Exterior siding. (3) Floor surfacing. (4) Floor underlayment. (6) Facings for concrete forms. |