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March, 1925 MARINE REVIEW 31 CLIPSE TWO-SEAT PISTON RINGS ENGINEERS AND MANUFACTURERS OF MACHINERY ARE STRIVING TO SECURE THE HIGHEST DEGREE OF EFFICIENCY FOR THEIR PRODUCT; USERS OF THIS EQUIPMENT ARE STRAINING EVERY NERVE TO OPERATE IT EFFICIENTLY AND ECONOMICALLY. ALL KINDS OF LABOR SAVING DEVICES, POWER CONTROL APPARATUS AND EFFICIENCY METHODS ARE INSTALLED TO ACCOMPLISH THIS END. AND YET, AT THE MOST VITAL POINT OF THE WHOLE SYSTEM THERE IS A WASTE WHICH CONTINUES TO EXIST UNCHECKED. . IN SPITE OF ALL THE PROGRESS IN THE ENGINEERING FIELD IN PERFECTING THE MANY TYPES OF MACHINES NOW IN USE, THIS ADVANCEMENT HAS BEEN MADE IN EVERY DETAIL OF THE MACHINES EXCEPT THE MOST VITAL—THE PISTON RING. THIS APPARENTLY INSIGNIFICANT PART OF THE MECHANISM HAS NEVER BEEN IMPROVED. IT IS THE SAME AS IT WAS YEARS AGO. THE FORM HAS BEEN ALTERED, BUT IT IS THE SAME CIRCULAR PIECE OF METAL, BUTTED TOGETHER, AND HAVING A WIDE OPEN OR ONLY PARTIALLY CLOSED GAP. THE ADVENT OF THE ECLIPSE TWO-SEAT PISTON RING HAS BROUGHT THE PISTON RING ABREAST OF THE IMPROVEMENTS IN THE OTHER DETAILS OF THE MACHINES. IT HAS SUC- CESSFULLY SEALED THE GROOVE AND STOPPED THAT HERETOFORE EVER-PRESENT NEEDLESS Jj. W. S. MOSS 644 RIVERSIDE DRIVE CABLE & RADIO ADDRESS 2310-12 N. SECOND STREET NEW YORK, N. Y. BELLMOSS, NEW YORK PHILADELPHIA, PA. MANUFACTURED BY HOPE MACHINE CO. Babcock & Wilcox WATER TUBE MARINE BOILERS AND SUPERHEATERS FOR NAVAL AND MERCHANT VESSELS OF ALL CLASSES Installations total over Six Million Horsepower. MECHANICAL ATOMIZING OIL BURNERS FLEXIBLE RELIABLE EFFICIENT Over Five Thousand Installed in Naval and Merchant Vessels. CONCENTRATION APPARATUS FOR MEASURING SURFACE CONDENSER LEAKAGE, BOILER WATER SALINITY AND OTHER USES. OIL SEPARATORS FOR AUTOMATICALLY REMOVING OIL FROM BOILER FEED WATER THE BABCOCK & WILCOX CoO. Marine Department 85 LIBERTY STREET, NEW YORK Please mention Martine Review when writing to Advertisers