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84 THE MARINE REVIEW York and other lines, will immediately begin the erection of a $200,000 plant for the construction and_ repairing of barges, tugs and other vessels at Nor- folk, Va. The new yard at Norfolk will be in addition to the ship yard the company now maintains at Chesapeake City, Md. The headquarters of the com- pany are at Philadelphia. Book Review The Naval Constructor, by George Simpson; 820 pages, 314 x 6 inches, cloth. Published by the D. Van Nostrand Co. and furnished by The Marine. Review for $5 net. . The Naval Constructor is a handbook covering the essentials of ship design Power HE accompanying photographs : show a power windlass outfit, in- stalled on an 1,800-ton steel barge, which runs between New York City and Boston. This outfit consists of a 6-horsepower stationary engine, built by the Gray Motor Co., Detroit. The engine is equipped with a one- way clutch with a double reduction, by means of chains and _ sprocket. This reduction is approximately 20 to 1. The clutch was furnished by the Snow & Petrelli Mfg. Co., New Haven, Conn. The windlass is de- signed to lift two 1,500-pound anchors. February, 1917 llass ation with this railroad, for a large portion of the year, the available time for navigating Hudson bay and straits at the present time being only two months (this’ being the recommenda- tion of the Canadian government), while with oscillator installed this could be increased to five or six months; ap- plied to the Great Lakes generally, it would make both cross and_ inter-lake navigation possible throughout the year, an immense advantage to shipping which is readily apparent; car ferries could operate continuously, thus greatly ac- celerating freight movements and_ pre- GASOLINE POWER WINDLASS OUTFIT USED ON OCEAN-GOING BARGE for students, naval architects, ship build- ers and others associated with the ma- rine industry. The book is unusually complete and contains data concerning most of the innumerable problems met with in marine design. Formulas are given for the many computations and, in addition, many discussions of the various factors affecting ship design are included. The book contains a number of tables and data on the weights and physical properties of steel plates, chan- nels and other structural steel used in naval construction. Tables containing physical data on timbers are also sup- plied. Among other valuable features contained in this book are designs for various standard parts of equipment, such as riggings, rope, fittings, gun mountings, windlasses and tackles. A number of the chapters are devoted to material concerning lifeboats, rafts, safety apparatus and rules. In addition to the information on design and cus- toms relating to ships, considerable tech- nical data are appended, including tables of measure, capacities of different sized tanks, unit equivalents, trigonometrical functions and other mathematical tables. WoC. Dishrow . dec Zi. Cortlandt street, New York City, distributor for the Gray Motor Co., is planning to bring out a windlass outfit for small boats. This outfit will be composed of a 134-horsepower Gray stationary engine with a 16 to 1 gearing to con- necting rods running through the deck and working direct to the wind- lass levers. A one-way clutch will be used so that the engine may be used to drive a bilge pump without having to work the windlass. It is expected that this outfit will be found useful to small boat owners, who will find it a labor-saving device. Ice Breaking Device (Concluded from page 78) following examples of how he believes his invention would be of value: It would make Montreal and Quebec as accessible for ocean shipping in winter as in summer; when the Hudson Bay railroad is completed, the successful navigation of the Hudson bay and strait will be made possible in co-oper- venting congestion at railway terminals and exchange points. The weight of a gyroscope with pre- cessing engines is less than 1 per cent of the vessel’s deadweight displacement. The actual size is dependent on the vessel’s construction and the position of the transverse metacenter with rela- tion to the center of gravity of the vessel. On a vessel such as the steamer AsH- TABULA, which has a displacement of approximately 6,000 tons loaded and a beam of 56 feet, a 35-ton wheel would be used. This would develop rolling moments of 5,000 tons, through simple precession and without imparting any undue strain on the vessel.- These mo- ments would cause this vessel to roll about 10 degrees. Extensive tests with gyroscopes were carried out by the United States navy on the destroyer Worpen -in 1913 to prove the correctness of the formulas relating thereto and to demonstrate that when properly installed, gyroscopes are perfectly safe and need but little at- tention.