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64 A Positive Uni- Directional Another Vital Feature of the New Kolster Radio Compass Unfailing in action, this Uni-Directional Indicator eliminates guess work or chance. It operates by a simple pull on a toggle switch and rotation of the loop. The direction of loudest maximum signal is observed instantly — and the result is positive. Photo shows the lower half of the new Kolster Compass, picturing position of Uni-Directional Indicator, Receiver case with sloping panel, illuminated dial, improved volume control, also the Head-phone and battery compartments. The receiver itself is a super-selective 8 tube Kolster creation, specially devised for compass work. Tuned by single dial— easy to operate. SEND FOR FREE FOLDER which pictures all the fifteen new Kolster compass improvements. Interesting! No obligation either. FEDERAL TELEGRAPH COMPANY 25 Beaver Street, New York Hobart Building, San Francisco NATIONAL G-R Multiscreen Filter Diesel Engine Keeps oil out Forgings of the boiler We manufacture High Grade Carbon and Alloy Steel Forg- ings, furnished smooth forged, rough turned, heat treated and finished complete; specializing in Diesel Engine Forgings, Hollow Bored Forgings, rough or finished bored, and Ordnance Work. S =< St Valera cc. National Forge & Ordnance Co. | , IRVINE, WARREN CO., PENNA. THE GRISCOM-RUSSELL CO. Bell Phone: 55 Youngsville, Pa. 285 Madison Ave. Branch Offices New York Chicago Cleveland New York Detroit Chicago Office: Monadnock B!ock Branch Offices in Principal ports Sees eeeseesensssssssssssssussssssnsssnssanssmsce MARINE REVIEW—October, 1927