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ectric Driven Auxiliaries Lower Operating Costs Motor driven circulating pump on the 3870-horse power diesel electric tugboat VAN Dyke III Electric Drive for Auxiliaries on Diesel Ships Has Dem- ‘onstrated Economies in Fuel and Up-Keep—Highly De- veloped for Marine Service in Both Steam and Motor Ships TYPE of motor developed es- A pecially for above-deck use in conjunction with anchor wind- lasses, capstans, and cargo winches, is shown in an accompanying illustra- tion. It is totally enclosed, water- tight and carefully made to resist the entrance of water even if submerged for short intervals, and designed for installation on deck without additional protection from the weather. All fit- tings subject to corrosion, are made of noncorrodible material or have noncorrodible surfaces. The construc- tion of the bearings is such that, should water creep along the shaft, it enters a drainage chamber located at the outer end of each bearing housing, which drains into the motor frame and thence to the outside through check valves which are situated at each end of the motor frame near _ The author, Frank V. Smith, is an en- gineer attached to the Federal and Marine de- partment General Electric Co. Part I of this article appeared in the November issue of MARINE REvIEW. Part II BY FRANK V. SMITH the bottom to give complete drainage. One of the early difficulties en- countered in deck auxiliary electrifica- tion was due to the attempt made to use motors intended primarily for land service. The early trials, al- though of great engineering value, in- asmuch as all the weak points were brought rapidly to the surface, re- sulted in much criticism and _ predic- tion of failure. The rapid manner, however, in which all the difficulties have been surmounted is a_ great credit to the electrical manufacturers, and thanks is due to the motorship for forcing the issue and making it worth while for the electrical manu- facturer to really design special equipment for meeting the peculiar conditions required in sea service. Under-deck Auxiliary Electrification The policy on all new motorship construction is to completely electrify the auxiliary equipment both for deck and underdeck. On_ reconditioned vessels (steam to diesel drive), elec- 18 tric engine room auxiliaries are also favored. As to the electrification of the deck auxiliaries on such recon- ditioned vessels, opinions differ, and to date, it has been about a fifty- fifty proposition. The full economies, due to electrifi- cation, are difficult to show on a dual basis. One of the principal items of expense in auxiliary electrification is the generating plant. Increased cap- ital expenditures are best warranted when the machinery, so represented, is kept in operation. Keeping such equipment busy at sea, but not in port, means that part of the prin- cipal economical advantage is lost. On steam vessels of all types, there has come about a distinct realization on the part of operators of the large proportion of fuel which is used for auxiliaries alone; on some types of ships operating at full power, the per- centage is as high as 40 per cent of that used by the main engines. When operating the main propelling ma-