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November, 1917 THE MARINE REVIEW 29 Reliable Marine Service With your vessel a thousand miles from the nearest hardware dealer, a broken union is a mighty serious matter. This situation will never arise if you use the Mark Union. The Mark Union insures tight joints. The, Mark Union is made from rolled steel which gives it great Strength to withstand the unusual strains which occur on board ship. It expands and contracts in the same ratio as the steel pipe on which it is used, preventing thread leaks. ' No Union is too good to use on Marine piping—always specify the “Mark.” MARK MANUFACTURING COMPANY 1901 DEMPSTER STREET EVANSTON, ILL. Eliminate power losses! High efficiency in steam generation is a necessity. Of the many factors which contribute to boiler efficiency, a tight blow-off is a most important one—a small leak at this point having a marked effect in increasing operating costs. The LUNKENHEIMER “DURO” BLOW-OFF VALVE is the logical valve for this important service. It will remain tight under the most severe operating conditions. The peculiar construction of the ‘“‘Duro”’ Seat-ring and Disc provides self- cleansing seating surfaces. To further enhance its durability, the Disc is reversible, and all parts including the Seat-ring and reversible Disc are renewable. There is a size for every boiler; with material combinations to suit all pressures and service conditions. Specify Lunkenheimer ‘‘Duro” and insist on its installation. Write for booklet No. 515-FH. THE LUNKENHEIMER ce. —ae “QUALITY "=— Largest Manufacturers of High Grade Engineering Specialties in the World New York Chicago CINCINNATI Boston London 16-14A-68 Please mention THE MaRInE REVIEW when writing to Advertisers