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ee Py Na Sal ha oe Important Offer to Tugboat Owners Would you like a Guarantee to Increase Hawser Pull and Maneuverability if UNITED GIVES IT TO YOU GRATIS v7 ¥ Nimble tugs that deliver full performance are more than ever essential these days—a condition which, ordinarily, costs money to bring about. UNITED SERVICE, however, now offers to owners of harbor craft a new. feature of its research facilities which involves neither cost nor obligation yet has great value to the operator: a specifically guaranteed increase in hawser pull and greater maneuverability. This guarantee is based upon exact tests with precision instruments that record the tractive efficiency of the boat with your present propeller and provide the data for an Individually swe’ United Precision Propeller. uztertin Tell us when you can spare a boat for a couple of hours, as many others already have done; we'll try to suit your convenience. This does not mean that you must buy a wheel from us now or ever; it simply means that, when next you need a wheel, you will decide whether you want definitely increased pull and quicker handling, with no premium price. Mr. Millard Moore is arranging the schedules for these tests; why not phone him? Voy ¥ nee LINITED DRY DOCKS. cititsiie INCORPORATED : Tug "K. WHITTELSEY™ gains 15% more hawser pull and 50 degrees lower exhaust temper- ature with its United Precision Propeller MARINE REview—June, 1931 81