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24 MARINE REVIEW. ites 31, GIDDINGS & STEVENS DESIGN OF MARINE ENGINES. One of the illustrations presented herewith is a side elevation of the new two-cycle marine engine, with propeller shaft and reversing propel- ler complete, designed by Giddings & Stevens, mechanical engineers of Rockford, Ill. This firm has brought out dii- ferent sizes of engines--l, 2, 214, 4 and 6 H. P.--which are becoming deservedly popular and have 'been adopted by several engineers throughout the country. As will be noticed by reference to the second _illustration--the same engine in stationary form on a square sub-base--the passage way from the crank case into which the engine compresses the mixture to the cylinder is cast as a part of the cylinder or frame casting, thereby doing away with a lot of unsightly pipes and fittings in making this connection. In this passage way - will be noticed the taper plug valve, which is used as a throttling valve for stopping and starting, and for stationary uses is connected to a spring governor top, as shown in the cut, which will give a very steady and uniform motion for stationary work, throttling the amount of mixture delivered to the engine for each cycle or impulse, according to the de- mand of the load. The engine has its main shaft bearings packed against loss from leakage and is also fur- nished with an improved design of con- necting rod, both end brasses of which may be taken up simultaneously through the hand- hole plate clearly shown in the cut. The pis- ton serves as its own inlet and exhaust valve , aoe and the single eccentric shown in the cut operates the circulating water pump. and also igniter, current for which is furnished by one of the» mag- netos supplied to the trade by Giddings & Stevens. ' As will 'be seen by reference to the water outlet on top of the cylinder head, the latter is jacketed as well as the cylinder. It will be noticed also that the fly wheels are of ample proportion to give excellent regulation, and an ad- ditional driving pulley can be furnished if desired or belts taken. directly trom the fly wheels of cach engine. The re- _ versing propeller shown in the cut is one which Messrs. . Gid- dings & Stevens have already periected and brought out and which is included in the com- plete set of working drawings which they generally furnish to customers who adopt the design for manufacture to the trade. To such parties they are pre- _pared to furnish complete sets of brass and iron castings of all parts required. A self-receding crank pin is shown in the rim of the fly wheel only partly drawn out. Altogether it. will be noticed. that this. design is one of the simplest and neatest yet offered to the trade. Ex- S treme simplicity vf parts render it easy of 'manufacture in machine shop with ordinary equipment, and the very popular demand for these engines for boat and stationary uses has led several firms to take up their manufacture as a side line. __ The designers of this engine report the recent completion of contracts for complete sets of working drawings as follows: Designs for a pair of heavy dredge boat engines to the Bucyrus Co. of Milwaukee; a five-drill compressor pump to the Union Iron Works of Spokane, Wash.; twelve sizes of standard Corliss engine drawings to a prominent eastern engine building firm; a Corliss cylinder and valve gear complete used on direct- connected ice machines for the Hutteman & Cramer Co. of Detroit; four sizes of standard four-cycle gas engine drawings to the Union Iron Works of Pittsburg; the same to the Union Iron Works of Memphis; seven sizes of gas engine drawings to_the Braddock Machine & Manu- facturing Co., Braddock, Pa.; six sizes to the Jno. Gillies Estate Co., Ltd., Carleton Place, Ontario; four sizes to the Blakeslee Co. of Birmingham, Ala., and four sizes of the two-cycle marine type to Fay, Bowen & Co. of Auburn, N. Y., J. C. Gehring of Port Huron, Mich., American Boat & Machine Co. of St. Louis, the Blakeslee Co. of Birmingham, Ala., Central Iron Works of Quincy, Ill., and Presque Isle Gas Engine Co. of Erie, Pa. Miscellaneous designs and drawings have been furnished to the following parties: Seaforth Engine Works, Seaforth, Ont.; Lexington Electric Machine Co., Lexington, Ky.; C. E. Lykke, Grand Island, Neb.; Monroeville Machinery Co., Monroeville, Ind.; H. Bieder, Ashtabula, O. ' SUMMER COURSE AT NAVAL WAR COLLEGE, _ Capt. Stockton, U. S. N., president of the naval war college at New- port, who is in Washington attending the meeting of the campaign board fe the navy, had a conference this week with Assistant Secretary of the avy Hackett and Adjutant General Corbin of the army, in regard to the assignment of army officers for the summer course of instruction at the college. Arrangements were made to assign to the naval war college five officers on duty at West Point. They are Col. Davis, judge advocate: Lieut.-Col. Bellinger, quartermaster; Major Knight, engineer corps, and Lieuts. Chamberlin and Davis of the line. It was arranged also that other officers of the army would go to Newport whenever they could get the opportunity to deliver lectures on military topics or to observe the work- ings of the course of instruction, them of any special design of frame, from portable machines for light AN ATTRACTIVE TOOL CATALOGUE. The Pedrick & Ayer Co. has just issued a new catalogue of 126 pages, illustrating the standard special railroad appliances of which they have been noted makers for many years. Some new tools are shown in their compound locomotive cylinder boring bars and special Corliss valve seat boring bars, and there is a radical departure from former catalogues in a very complete line of pneumatic hoists, vertical and horizontal, with necessary appliances, as well as jib and traveling cranes, which are illustrated together with some interesting installations of same. Especial attention is given to the improved pneumatic riveting machines which the Pedrick & Ayer Co. build. It is only recently that this concern has gone extensively into the market on riveters, but they are now prepared to furnish work up to the heaviest stationary riveters for large boiler work, and cover a line of structural designs, including hinged riveters for intercostal work on vessels, where it is next to impossible to get at the rivets to drive them by hand. A decided change in the ratings of the company's machines is noticed in the new catalogue which gives the total effective pressure exerted on a rivet, with various sizes of standard frames, ranging from 48,000 pounds to 188,000 pounds exerted pressure on the rivet, also the length of the final effective stroke which carries this maximum pressure. Whether the rivet be 214 inches or 8 inches, the constrtiction of the machine takes up the difference instantly, without any adjustment, and then admits of so much effective stroke. In arriving at the effective pressure desirable for a given size rivet, the Pedrick & Ayer Co. State that it is the practice of the best concerns to make a distinction of 20 per cent. less pressure on rivets for structural work than for steam-tight work. Every engineer, therefore, in selecting a rivetéer, should determine whether he wants to control a shearing strain only as is customary on structural work, or whether the machine must possess not only the shearing strain but the binding strain to make the work steam-tight. Copies of the catalogue, we are informed, may be obtained free upon application at the sole selling offices of the company, 85-87-89 Liberty street, New York. AUTOMATIC RELEASING HOOKS HIGHLY PRAISED. An article in the Review of June 10 described a unique and valuable publication--"Standard Boats of the United States Navy"--compiled un- der the direction of Rear Admiral Hichborn, chief of the bureau of con- struction and repair. Boats of the United States navy have been thoroughly standardized after the utilization of the highest science in their construc- tion, supplemented by the practical experience of our naval captains and of the sailors who pull the oars. The book was published so as to provide information that would enable any boat builder to construct United States naval boats if they were needed in great numbers in time of war. They are now built in the navy yards. It is certainly a great compliment to the Standard Automatic Releasing Hook Co. of New York that a full page illustration in this work should be devoted to showing in every detail the standard hook as attached to a 'boat. To meet the approval of the navy cepartment a device of this kind must be practical and must undergo severe tests. Even with the best of life-saving devices ship owners are often sceptical. They cannot always be-blamed, however, as the government is sometimes used in adopting regulations regarding shipping to force worthless appliances upon the: vessel owner. But the general use that is now made of the Standard company's hook by leading passenger lines, as well as on government vessels, is evidence of its merits. Capt. Ira E. Dole of the Old Dominion company's steamer Yorktown says: 'Your hooks do just what you claim they will do. They are a great help in handling a 'boat safely and quickly and I will recommend them to the heads of our company." Capt. Geo. H. Goddard of the United States light-house tender Cactus says: 'Your device works to perfection and is all that can be desired for'the purpose for which it is intended. It is certainly a most important item of equipment and should be adopted on all vessels." Capt. H. C. Doggett of the steamer City of Augusta, New York, says: "The hooks fitted to life boats on the steamship City of Au- gusta I have tested in port and at sea. When I took off the passengers from the burning steamship Leona, I found them to work to my entire satisfaction and recommend them to all shipmasters and others." A steamer of 440 feet length and, of about 6,000 gross tons capacity for the Wilson fleet of Cleveland was ordered from the Jenks Ship Build- ing Co. of Port Huron shortly before the death of Capt. Thomas Wilson. This vessel is to be the largest and most costly in the Wilson Line. It is fitting that she should be named Capt. Thomas Wilson. A steamer of the Rockefeller fleet bears the name of Thomas Wilson, but it is hoped that this may be changed. BACK NUMBERS OF THE REVIEW.--Liberal subscription ex- tensions will be made by the Marine Revi i Feb 4 1897, be Jane ar ieee arine Review for issues of Jan, 21, 28 or