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52 trical manufacturers have brought their devices to such perfection for this service that, in spite of exposure and hard usage, they are ready for service at all times with no tuning up. Motors, solenoid brakes, controls, resistors and other parts are made submersion proof and impervious to salt air or water in their windings and terminals. Not the least of the advantages of the electric hoist is the compound- wound motor’s capacity for over- load that makes these machines not only flexible in operation but capable of tackling jobs far beyond their rated capacities. The cycle of hoisting, burtoning and lowering can be continued for many hours without undue heat rise and where there is dynamic braking, current is returned to the line when lowering. The overload capacity on the cap- stan is just as valuable as on the hoist to meet extreme and unexpected conditions. In any of these emergencies the steam machine would stall. This is a fact which cannot be lost sight of when comparisons of first costs are made. When steam machines are installed it often is necessary to pur- chase machines of greater rated ca- pacity than when electric machines are used in order to obtain a mar- gin of safety to meet the emergencies MARINE REVIEW which electric machine would take care of as overloads. The steering gear should be elec- tric or electrohydraulic, the latter be- ing more economical for several rea- sons. The fact that the stroke of the pump is adjustable to meet load conditions makes it possible to use a much smaller electric motor than would be required to do the work mechanically. The electric motor is started on leaving port and runs con- stantly during the entire voyage. There is no starting and stopping every time the wheel is moved, with high inrush of current, snapping con- tactors and solenoids. Electric Steering Gears The electrohydraulic steering gear has great flexibility as to the man- ner of installation and by making the rams opposed or duplex it can be built to suit the space available, al- most without exception. When it is not practicable to con- nect it to the rudder post the elec- trohydraulic steering gear can be lo- eated anywhere aboard ship by sub- stituting sheaves for the tiller cross- head. The motor is full shunt wound, run- ning at constant speed under varying load conditions, the speed being the same as the efficiency revolutions per minute of the pump and the motor direct connected by a flexible coupling. November, 1926 In the cruising or “unsteady” angles but little power is used. When the wheel is at rest the motor is idling the pump on neutral stroke and con- suming practically no power. Electric auxiliaries on diesel ships dispense with the need for boilers, condensers, and pipe lines, and with the possible exception of hoists, can be run from the auxiliary generators. Perfection in selective control, with any speed required from zero to a maximum, can be obtained by using the electrohydraulic drive on other auxiliaries besides the steering gear. This advantage is being realized gradually and there already are some notable installations, the ALOHA, SraLtA. and DAUNTLESS being three that stand out in the yacht class. The navy adopted it for the powerful capstans on the airplane carriers LEXINGTON and SaratoGca. It also has been in use by the navy for other purposes, especially turret turn- ing, where nicety and precision of control are absolutely essential to correct gunfire. The pumps and hydraulic motors used in this drive are very fine pieces of mechanism, built of the finest hardened materials and machined to an excellence that the service de- mands. This makes such devices somewhat more expensive, but there is no question as to their economical saving over any other drive. Tiina aval Architects Meet in New York Nov. 11-12 © = A PROGRAM of exceptional interest has been the U. S. Battleships Maryland, West Virginia, arranged for the thirty-fourth general and Colorado,” by Capt. William McEntee, C. C., TUESAT VGATICOHTCGHTNGTVLVTAUUGGTUATIOTIUUOTTHONTVUOTIIUOTIIGNTIEEATIEONTLUGTICGTHIOAATCOATUOTT COMI LEIAAIUOTIIOOLHOOGIILOMAUCAITALOADEOUTTCOATELOVLLUGALUOOALEAATEOATICOTIUOOORUOATLCGAIOATTOGANLCOOTOOATCUGNICOGAAUGNLOUUTIEONHROOAATOOATTODATLUATECONITUGTT UDOT meeting of the Society of Naval Architects and Marine Engineers which will be held in the Engi- necring Society’s building, 20 West Thirty-ninth street, New York city, Thursday and Friday, Nov. 11 and 12, 1926. Thirteen technical papers will be presented at the professional sessions which will begin each day at 10:00 a. m. The council of the society will meet at 3:00 p. m., Nov. 10, in the board room of the Engineering Society’s build- ing. The banquet, following long established cus- tom, will be held at 7:30 p. m. on Friday, Nov. 11, in the grand ballroom of the Waldorf-Astoria hotel. The titles of the papers, their authors, and the order in which they are to be delivered follows: THurRsDAY, Nov. 11, 1926 1. “Maximum Block Coefficients and the Eco- nomic Disadvantage of Full Form” by W. J. Lovett, visitor. 2. “Naval Development of Floats for Aircraft” by Commander H. C. Richardson, C. C., U. S. N., member. - 3. “Launch of the Airplane Carrier U. S. S. Lexington” by S. W. Wakeman, member. 4. “Analysis of the Standardization Trials of U. S. N., council member. 5. “An Investigation of the Behavior and of the Ultimate Strength of Riveted Joints Under Load,” by Commander E..L. Gayhart, C. C., U. S. N., member. 6. “Corrosion,” by W. Bennet, member. 7. “The Strength of Propeller Shaft Struts,” by Lieut. W. P. Roop, C. C., U. S. N., visitor. Fripay, Nov. 12, 1926 8. “The Flettner Rudder,” by Olav Overgaard, member, and J. Livingston, visitor. 9, “Engineering Aids to Navigation,’ by Com- mander Stanford C. Hooper, U. S. N., visitor. 10. “Considerations Governing the Selection of a Fleet for the Upper Mississippi River,” by Brig. Gen. T. Q. Ashburn, U. S. A., visitor. 11. “Performance Tests on Diesel-Electric Stern- Wheel Towboats,”’ by C. H. Giroux, visitor. 12. “Some Considerations in Design of Ferry Boats,” by Prof. C. F. Gross, member, and Charles Green, visitor. 13. “Diesel-Electric Propulsion,” by W. E. Thau, member. EAT TTT TT TOT CUE TNUUUOUUTUUUTN TUTE. LULU... 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