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In Ship Construction Is Unequalled The fact that all recent U.S. Naval Cruisers have been equipped with Tri-Lok Dur- aluminum Gratings and Tri-Lok Safety Hatchway Steps, is significant evidence of its acceptance among leading naval de- signers. The Tri-Lok design has the great advan- tage of simplicity ... uses no rivets, bolts, or welds... gives maximum strength with minimum dead weight... permits the use of any metal or alloy, in shapes to suit any engine room .. . affords the maximum opening for light, air and cleanliness. Manufactured by THE TRI-LOK COMPANY PITTSBURGH, PA. National Distributors DRAVO-DOYLE COMPANY PITTSBURGH, PA. MARINE REvVIEw—April, 1931 9