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Progress in Oil-Tank Ship Construction May tASTLONGER | ** O° + SS Eliminates Bulkhead Brackets Eliminates Bulkhead Leakage Greatly Simplifies Construction Greatly Reduces Cost of Damage Repairs Greatly Reduces Cost of Cleaning Tanks Substantially Increases the Longitudinal Strength Beyond the Well-tried “Isherwood System” Shipowners are advised to specify that plans and structural arrangements should be approved by SIR JOSEPH W. ISHERWOOD & CO., Ltd. 17 BATTERY PLACE, NEW YORK and 4, LLOYD’S AVENUE, LONDON, E. C. 3 1 because they can be recupped oftener without annealing Wheels Propeller 5%. to fit any hub. ~ Sheriffs Manufacturing Co. Established 1854 Milwaukee. Wis. Wrhaen a Rich Red Head Rivet Set needs recupping, just chuck it into a lathe and turn out the burr cold. No annealing is necessary Oldman-Magee Boiler Works, Inc. —and you can recup a Rich Red Head many times more than ordinary rivet sets. Boilers, Tanks, Stacks, Struc- tural Work and Castings Send for a sample—stating the size and kind Mite CGD hee of shank. Test it against any other make of Wakes: 36.40 Tlincis Strect BUFFALO, N. Y rivet sets you are now using. That will prove ae oe ; oo to you how much more you get for your money when you depend on Rich Red Heads. LANE LIFEBOATS R ' Cc ee BYRD ANTARCTIC aides ra EXPEDITION Manufactured by : 68 MARINE REVIEw—June, 1931