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January, 1917 in every respect to the rules of the Bureau of Veritas for a vessel of this special class. The cars are carried on the main deck, which is fitted with four railroad tracks. The stern of the vessel is of such shape as to fit neatly in the docks provided at Key West and Havana. The cars are loaded on to the vessel at the stern. Every appliance has been fitted for properly securing the cars at sea. When the cars are stowed, their weight is taken upon jacks fitted to jack rails, thus relieving the tracks from the surge and weight due to the rolling - of the ship in a seaway. The quarters Lrguie (talc for carrying molasses are also provided together with the necessary pumping apparatus for handling this cargo. Cer- tain portions of the vessel are fitted with a double bottom for feed water, with large ballast tanks for service when the vessel is running light. In addition to the provisions for purely commercial service, attention has been paid to the possibility of fitting her out as a gun boat and transport in case of war. Ample arrangements have been made to mount rapid fire guns of 5-inch caliber and smaller, as may be required. In brief, Parrott will play her part in the preparedness program. PRINCIPAL DIMENSIONS Length overall k49-g"Lerigith PP(O5-0'WL.) 337°3" Bed /folded_ 57-0" Depth/Tolded ro/rain Deck 22°0" [TalTe Spachig 27" | Vi SHELTER DECK SECTION THROUGH ENGINE Room OTBD. SIDE LOOKING AFT Bape INE al oe 28-6 SECTION THROUGH Boiler Room THE MARINE REVIEW 3 ble original data. Among the original methods developed by Professor Bragg are, a method of. obtaining the mean bearing loads, the use of the mean lead in the solution of valve diagrams, and methods of designing turning engines and condensers. The major portion of the text is de- voted to the principles underlying the determination of cylinder dimensions, and to the design of the several engine parts. In chapters on cylinder dimen- sions, the important role of thermo- dynamics is emphasized. The _ section devoted to the design of engine parts pays particular attention to the im- LracKe’s at Jopor 10'Cever Litre Charirel SfarrcHuorns BLACK CS OF. HUVECS WITH) Wo Braces STBD. SIDE LOOKING AFT GENERAL CROSS-SECTIONS OF NEW CAR FERRY of the officers and crew are on the shelter deck. The propelling machinery consists of two triple-expansion reciprocating en- gines, of standard marine design, having 20, 32% and 54-inch cylinders by 36-inch stroke. The engines will develop 1,350 horsepower at 100 revolutions per min- ute. The boilers are of the Scotch type, being single-ended, return-tubular, cyl- indical boilers, 13 feet 2 inches in diameter and 12 feet long, fitted with two corrugated furnaces, 48 inches in diameter. The vessel is equipped with an electric light plant, electric mooring winches and winches for handling the cargo. Two deep tanks of 600 tons capacity Book Review Design of Marine Engines and Auzil- iaries, by Edward M. Bragg, professor. of naval architecture and marine engi- neering, University of Michigan; cloth, 182 6x 9-inch pages, 4 charts. Published by the D. Van Nostrand Co. and fur- nished by The Marine Review for $3, net. A comprehensive text on the design of marine engines must necessarily in- clude data gathered from the experi- ence of a number of successful engine builders. The author of Design of Ma- rine Engines and Auxiliaries has not only presented the recognized standards of designs as followed by prominent engine manufacturers, but has _ supple- mented this information with considéra- portance of the physical properties of the materials used for these various parts, to the selection of stock, and to so designing it that it will stand up under the variety of stresses imposed by service. The discussion of engine balancing includes the correlated work of a number of investigators. The re- mainder of the book contains informa- tion in regard to the design and func- tion of auxiliary apparatus. Condensers and air pumps claim the greatest share of the author’s attention. Turning and reversing engines are discussed in the concluding chapter of the book. The text is well illustrated and the informa- tion is presented in a manner that is unusually thorough and clear. Pree as