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A Fog Signal, Power ful—Positive— Reliable—Economical WESTINGHOUSE PNEUPHONIC HORNS— air operated, are used extensively in marine service for a great variety of signal purposes—the small single bell type for light craft such as patrol boats or yachts, the double chime horn for larger boats, and the multiple combination of large horns for light houses and other shore warnings... This horn emits a pleasing sound that can be heard distinctly for miles. It is positive in action by virtue of its counterbalanced diaphragm (a patented feature) and blasts can be made in quick succession when desired. The construction is very simple and reliable action is assured. Economy is another outstanding characteristic as the horns are easily installed, need no adjustment, and require very little air for their operation. : WESTINGHOUSE TRACTION BRAKE CO., Industrial Division, Pittsburgh, Pa. The air compressor illustrated is the Westing- house, Type N, that furnishes air for operation of the Pneuphonic Horns in light house service, shown above. Westinghouse air compressors are available in many types and sizes ranging from 2\4 to 300 cu. ft. displacement for all classes of marine service. 50 MARINE REview—March, 1932