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ae 30 THE MARINE REVIEW March, 1919 Gh Sioned lor EfFicienc oy Durability Service Descriptive bulletin upon request . ST. JOSEPH, MICHIGA LLLP PERFECT PROPELLER WHEEL Propeller is true in diameter, balance, itch, angle of blade and surface. Bic blade is located at exactly right angles with the next. The surface of every blade is absolutely true with the surface of every other blade, each point being parallel. We claim for our propellers increased speed of ship over anything made and resulted increase in economy of operation, as well as saving in ma- chinery upkeep. GEO. H. THACHER & CO. Main Office and Works: ALBANY, N. Y. Please mention THE Marine REVIEW when writing to Advertisers