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4 Prevent Maintenance Troubles 1. DEARBORN WATER TREATMENT You can keep your boilers free from scale and corrosion, and prevent carryover with Dearborn Feedwater Treatment and Engineering Service. Dearborn engineers will make a careful study of your in- dividual water conditions, furnish a treatment balanced to fit your needs, advise you on blowdown and other con- trol tests, and make frequent check-ups to insure satisfactory boiler operation. 9. NO-OX-ID RUST PREVENTIVE Your steelwork can be protected perma- nently with NO-OX-ID. When applied over rusted surfaces, NO-OX-ID pene- trates to the base metal and immediately stops all corrosion. NO-OX-ID forms an oily film that is not affected by water. Write for information. MV a Rad OY WP ih tee ee a 310 S. Michigan Ave., Chicago, Ill. noonannanoongog 3 HOW -fO USE THE DIRECTORY a mi Beginning on page 45 are listed more than 1500 vessels available for service on the Great Lakes for the season of 1941. In addition to management, chief operating personnel is given where possible. In the case of bulk freighters technical data, such as keel length, beam, depth, distance be- tween hatches, and carrying capacity at 20-ft. draft are given. mg To find the name of the owner, captain or engineer, refer to the name of the ves- sel in the alphabetical index. Each list- ing in this index carries a number which re- fers to the fleet to which the vessel belongs and is found preceding the owner's name in the fleet listing. mm On page 127 a directory of shipbuilding and ship repair yards is given, listed alpha- betically, with the names of officials and pertinent data. WE On page 144 a Where-To-Buy directory will be found, conveniently listed under each port. +. Copyright, 1941, The Penton Publishing Co. Cleveland, Ohio