Page:Popular Mechanics 1928 11.pdf/37

 



Department of commerce officials are endeavoring to induce the adoption of a uniform style of markers to guide flyers along the airways of the nation. Different colors will be used for different cross-country routes, and other distinguishing details will be employed, according to present plans, to make it easy for the pilots to tell where they are. When the proper form of markings has been decided upon, it is intended to have them widely displayed to make them known.

 



Greater economy, a saving of time, and other advantages, are claimed for a patented form of wall construction which leaves the interior in such a finished state that it is not necessary to use plaster. The essential feature of the method is its interlocking units which may be made of metal, concrete, fiber, gypsum or other materials suitable for wall construction. These units are molded in long channel shape and are set on end instead of being built up as the ordinary wall of blocks or of brick. The length of the channel depends upon the height of the story, it is two feet or more wide and has an interlocking flange that holds it to the channel placed next to it. The depth of the channel depends upon what thickness of wall is desired, and the interior of the unit forms a dead-air space which affords insulation or may be used for wires, pipes or other conduits. Where a column is desired for support, the space may be filled with concrete. When finished, the wall requires no stone or other covering on the inside, while the joints on the outside may be concealed beneath any appropriate form of finish.

