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\Vest Coast Lumber Industry Exhibits Timber Aerial Mapping of Tahoe National Forest Engineering at San Francisco Fair

The California Region of the U. S. Forest Service is now preparing to make aerial photographs of the entire Tahoe National Forest-first of California's 18 National Forests to be completely covered. A Forest Service photographic plane and crew just arrived at Sacramento from headquarters of the Rocky Mountain Region in Denver, Colorado to fly the project.

About 4,000 square miles will be photographed-from Smartsville at the edge of the Sacramento Valley to Reno, and from the north end of the Sierra Valley to the south end of Lake Tahoe. The elevation varies from 30O feet near Smartsville to 10,800 feet, at the summit of Mt. Rose, just northeast of Lake Tahoe. The plane will therefore have to fly at nearly 24,W feet over the higher parts of the Range.

"Photographs of all 18 National Forests in California will not be available for a number of years," Regional Forester Show said, "but there is no question as to their value in the administration of the Nation's forest areas."

Exact in every engineering detail, a miniature model of a bridge from structural Douglas fir has been made by the West Coast Lumbermen's Association for the industry's exhibit at the San Francisco World's Fair. The scale of the model is one-half inch to one foot. Its tiny trusses and stringers of fir are so strong that the model supported two young ladies, the Misses Kay Randlett and Helen Sherman, weighing 110 and126 pounds respectively, rvithout deflection. The combined weight of the girls on the model represents, in proportion, a weight of 270 tons on the bridge from which the model was designed, according to Association engineers, while also in proportion, the girls would be 128 feet tall on the original bridge.

"Because its engineering detail is so exact, this model will f,rave real interest for engineers and architects who visit our fxhibit in the Palace of Ffonres and Gardens," C. J. Ilogue, head of the Association's Technical Service, declared. "It also holds promise of new business in structural timbers for lumber dealers. There is a great shortage in bridges for secondary roads, as there is in housing. Soon or late old bridges must be replaced, while there will be a steady demancl for new bridges on road projects.

"The design rvas worked up by the Association for a bridge over Dinkey Creek in the Sierra National Forest, 63 miles east of Fresno, California. With its 9O-foot span, 20-foot roadway, and 15-ton loading, this design is basic in meeting commor.r bridge requirements for secondary roads. The Association makes such technical service available to engineers and public agencies."

Speaking of the value of the photographs to the Forest Service, Regional Forester S. B. Show said, "This modern method of examining forest areas is without doubt one of the greatest boons to foresters yet fou.nd. By photographing the terrain so that one photograph overlaps those adjacent to it, the resulting prints, when viewed through a sterescope similar in many ways to the simple parlor sterescope of years ago, will produce an image in three dimensions in which the mountains, canyons, trees and other features stand up in relief just as they would appear to an observer flying over the country in an airplane. The photographs are, of course, made only when visibility is at its best. Therefore, the prints can be studied any time-day or night-rvith perfect visibility, at all times.

"Thus," he pointed out, "stands of timber can be accurately outlined and studied, erosion can be spotted, rang'ers and fire dispatchers are able to check and correlate reports on fires which may render lookouts and even aerial reconnaissance helpless due to smoke in the air. The photos are also of immense value in compiling maps, enabling engineers to make better maps at a lower cost than by the old ground method of mapping."

Canadian Shingle Quota Abolished

Formal exchange of certificates of ratification of the Canada-United States trade agreement took place in Ottawa on June 17, at which time the pact came into operation officially.

The new agreement binds free entry for a quantity of shingles imported in any year equivalent to thirty per cent of the average annual consumption in the United States during the three preceding calendar years. On imports in excess, the United States reserves right to impose a duty not exceeding twenty-five cents per square.

Influence

I think that to have known one good man--one man who, through the chances and mischances of a long life has carried his heart in his hand, like a palm-branch, waving all discords into peace, helps our faith in God, in ourselves, and in each other more than many serrnons.-Curtis.

Nu-\food Sealed Cold Storage Insulation Announced

Wood Conversion Company has just announced a new product-No-Wood Sealed Cold Storage Insulation. This product, adaptable to all standard construction, will be sold through lumber dealers.

Nu-Wood Sealed Cold Storage Insulation consists of units of Nu-Wood Insulation Board having a continuous double coating of water-proof asphalt on all surfaces and edges. This treatment renders Nu-Wood highly resista,nt to moisture or moisture vapor. The product is so designed that it can be readily used by the cold storage applicator, carpenter or even by mechanics of less experience.

In announcing this new product, P. A. Ward, sales manager, said "The total thickness of insulation required in cold storage rooms usually varies from 3" to 8" depending on the temperature difference inside and outside of the room. In order to eliminate continuous joints through the insulation, this product is designed so that it can be placed in two or more separate staggered layers. The size conforms to standard construction 76" on center.

"The first layer is placed between wood nailing strips, and the second layer is placed directly in contact to the first and is nailed to the strips. Each layer is set in emulsified asphalt adhesive. The entire insulation surface can then be finished rvith a trowel coat of emulsified asphalt mastic or metal lath and plaster.

"A similar type of construction is designed for floors. Co,ncrete, wood or mastic wearing surface can be installed over the insulation. In all construction. if desired. units can be applied with hot asphalt."

Nu-Wood Sealed Cold Storage fnsulation blocks are available lV2n', 7', 3" and 4" thick, measuring I4/s" x 32". Half size blocks l{s/g" x I€' and 7 3/16" x 37', can be furnished for staggered or broken joints.

Complete specifications and application instructions are available from the Wood Conversion Company, Saint Paul, Minnesota.

European Political Tension Affects Timber Markets

Washington, June 23.-Tension created by international political problems has had considerable effect upon the European timber market, the Forest Products Division, Department of Commerce, reported today.

Surveys of the market shor,v that the turnover between Scandinavian and other timber exporting countries and the western European importers have been retarded.

Prices, however, continued to advance and leading lumbermen take an optimistic view on future business prospects. Generally extensive rearmament programs, it is believed, will continue to make for an increased demand in the international lumber market, and this demand will probably counterbalance declines in private requirements.

Drastic curtailment of lumber production, because of the high cost of raw materials and reduced export quotas is expected to keep demand for timber well above the supply.

Fills a definite need in the construction or renovation of a building or r home where conven i ence, 3ervice and cost are plerequisites.