Transportation With Plywood

for every construction use, has stepped in to do many a it has proven itself in scores buses, moving vans and truck

Box cars must be built to "take-it" and when Great Northern selected Douglas fir plywood as the sheathing ma,terial lor 2,NO nerv cars )'ot1 can be sure that plywood, too, must be able to stand the most rigorous possible service. Douglas fir plywood was thornughly tested for strength, durability and t,oughness before r.vork began.

Steel was used to form the ends and frames of the cars, and on the outside, panels of Exterior type Douglas fir plyr,vood (rnade rvith completely rvaterproof binder) rvere placed vertically extending in one panel from the bottom to ,the top. Vertical joints betrveen the 4 x 10 foot panels rvere covered lty thin metal strips and bolted through to lumber studding. At horizontal joints, panels were riveted through to lumber stiffeners. Interior walls and ceiling r'vere completely lined rvith plyrvood, with the panels placed horizontally-adding to the tightness of the cars and providing protection against dust and cinders. These ply.lr'ood cars average trvo tons lighter than conventional cars.

Utilization of plyrvood for construction ofa bus for Santa Fe Trailu'ays likervise has resulted in a sturdy, dependable vehicle rvith smooth, clean lines. The entire exterior and interior, including the roof , is covered .ivith rl-inch plvu'ood, glued and screrved to the carlines, purlines and upright members. A11 of the super-structure is constructed ,of seasoned ash lumber.

Another example of plywood's serviceability in the transportation field is that afforded by plywood lined trailers of the Spokane-Pacific Truck Line is typical of a number of units used for hauling perishables in the west. They are used for hauling dressed meat between Portland, Ore., and Spokane, Wash. The trailers are 24-feet long, 8-feet high and 8-feet r,r'ide. Ouarter inch Douglas fir plywood is used to line the walls and ceilings. A Carbonic Control

Corporation refrigerator unit is enclosed in plywood in the ftont end of the trailer and furnishes 6@ cubic feet of chilled air per minttte to keep the interior at a given temperature. Builders say the plyu'ood saved considerable expense in construction of the "reefers" and is as strong as steel for u'alls and ceiling.

The popularity of Douglas fir plyrvood increases yearly because it is both economical and versatile. It is engineered for strength, each plv being cross iaminated rvith adjacent plies. It has no plane of cleavage, cannot be split, and pound for pound is stronger than steel.

Fritz Hawn, Northu,est Lumber Co., Dallas, Texas, formerly rvith Hammond Redrvood Co., and Coos Bay Lumber Co., in Los Angeles, was recently in California on vacation. He attended the S.M.U.-Santa Clara football game at San Francisco, September 27, visited friends in the San Francisco Bav district. and flerv to Portland.