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September, 1918 sary to provide means for milling dif- . is accomplished providing separate sets of uprights which are shown mounted between the crossrail and the base. Each pair of uprights is made of a suitable angle to accom- modate a certain angle of scarf. The uprights are provided with aligning slots and keys to insure proper loca- tion when changes from one set of uprights to another are made. ferent angles. 'This i this. «case by AirOperated Hand Planers A novel tool called an air planer has been developed by the Shipbuilders' Pneumatic Tool Co., Portland, Oreg,, for use in wooden shipyards. The de- vice consists of a substantial base in which is fitted a revolving cutter head, this head obtaining its rotary motion from an air turbine. The planers are made in three models, of which one js employed for smoothing the sides of vessels, another for surfacing large timbers that are often too cumbersome to handle on an ordinary wood planer, and a third for cutting grooves in ships' frames to accommodate steel strapping. It is claimed that one man can sur- face 385 square feet of a vessel's side in five hours, leaving a uniform smooth surface over treenails, knots, caulking, marine glue and pitch pockets. This operation is shown at the left in the accompanying illustration. The air sup- ply is controlled by a handle and the maximum depth of cut is 1-32 inch. This model weighs 10 pounds. The type used for surfacing large timbers is shown at the right. . Here the operator has bevel-cut the edge of the THE MARINE REVIEW MOISTURE PROOF SWITCH COVERS FOR MARINE INSTALLATIONS timber to a mark and has set the ma- chine for a deep cut with the object of effecting the operation formerly accomplished with an adze. This com- pleted, the planer is set for a light cut to finish the timber. This machine is operated by a double turbine horizontally mounted on an ad- justable carriage. It weighs 21 pounds. The unit employed for cutting grooves in frames is a modification of the machine just described but with a different knife adjustment. Cover for Push Switches Because of their ease of operation, double push-button switches are often used in marine installations. Their use has been restricted in some cases, how- ever, owing to the fact that they are not sealed against the admission of steam and moisture, which is harmful. 435 The Crouse-Hinds Co., Syracuse, N. Y., has developed a cover for switches oF this type which seals them against all' forms of moisture: In the accom: Ppanying illustration, the upper view shows a two-gang cover installed on a conduit while the lower views show a single conduit and cover. - The mechanism which operates the push buttons' is under the cover and is controlled by a shaft. At one end of the shaft is a' flattened projection for operating the push buttons while the other, or outer end terminates in a handle. The handle is marked with on and off indicators which are convenient in cases where the source of light is in a separate compartment . the switch. The part of the shaft whic passes through the cover is provided with grooves that are packed with hard grease. The grease serves to keep the shaft bearing moisture-proof, while a rubber gasket seals the joint between the cover and the conduit. Leases New Quarters . The Independent Pneumatic Tool Co. has leased the entire sixth floor in the Otis building, Chicago. This space 'contains 12,000 square feet and will be occupied by the company for its gen- eral offices. John D. Hurley, president of the company, stated that the great demand for pneumatic tools for gov- ernment work and_ shipbuilding had forced the company to seek larger quarters. The space now occupied contains 6000 square feet while the new quarters provide just double this area. ATR PLAN ERS DESIGNED FOR USE IN WOODEN SHIPYARDS