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26 engineers of the United States gov- ernment, the Russell Sage Foundation or the Carnegie Institute. ----_-- An Excellent Engine Record What has proved to be one of the most successful marine installations on the Great Lakes is the 7,000-h. p. en- gine on the Detroit & Cleveland Navigation Co.'s steamer, City of Cleve- - land. During the three seasons in which this steamer has been in com- mission, the propelling machinery has not caused the steamer a moment's de- lay, and the repair bill on the same is reported as being: absolutely nothing, which speaks well for the design, ma- terials, workmanship and the intelligent care in operating. This is the more striking when it is remembered that this engine is some- what novel in design, owing to the un- 'usual combination of valve gears, which necessarily entailed greater complication of detail than is usual on marine en- gines. Designed for service between Cleveland and Detroit, the difference in speed desired for day and night trips 'called for an engine which would be efficient through a greater variation of power than is practicable with the range of "cut-off" possible in ordinary link motion gears. The engine is of the three-cylinder, compound inclined type, having one high-pressure cylinder, 54 in. diameter, and two low-pressure cylinders, 82 in. diameter, with a piston stroke of 96 in. All valve gears are of the "releasing" type, the high-pressure cylinder being fitted with double beat poppet valves and oil dash pots, while the low-pres- sure cylinders have "Corliss" gear with the usual vacuum dash pots, the range of "cut-off" being from one-fourth to three-quarters of the stroke in each case. With this gear it is possible also to distribute the total horsepower so that each cylinder will develop one- third, a most desirable feature which is impossible with the ordinary arrange- ment of valve gear. Along with its remarkably smooth running the engine has shown a high steam economy and so well is the de- sign thought of that it will be repeated in its entirety in the 9,000-h. p. engine, being built by the Detroit Ship Building Co. for the new D. & C. steamer, now under construction by them, which will be placed in commission in the summer, of 1912. Steel Tug Andrew H. Green Johnston Bros., Ferfysburg, Mich., recently delivered the tug Andrew H. Green to the Great Lakes Dredge & Dock Co. of Chicago. The tug is of steel, 92 ft. long on deck, 21 ft. beam Stee. TUG ANDREW. H. GREEN. and 12 ft. molded depth. The engine is a fore and aft compound with cylin- ders 16 and 34 in. diameter by 26-in. stroke, supplied with steam from a firebox marine boiler 10 ft. diameter and 14 ft. long, allowed 165 Ibs. press- ure. 'The tug is equipped, with a Providence steam towing machine. Carrying Test of Steamers Palmer and Olcott During the early part. of: May the Pittsburg Steamship Co. tested out the carrying capacities of the steam- ers. William P, Palmer and W.. J. Ol- cott. Both of these vessels are of identical proportions and were both constructed at the Ecorse yard of the Great Lakes Engineering Works. The Palmer, however, is built upon the Isherwood or longitudinal system of. construction and the test was made to prove the claim of the designers that the Palmer would carry more than the Olcott under equal conditions. Both freighters loaded the same grade of ore and took aboard the same amount of fuel. The Palmer unloaded at the Pittsburg & Conneaut Co.'s dock at Cenneaut, drawing 18 ft, forward, 12 f+. 2 in. amidships and 18 ft. 4 in. ~afs. The bill of lading weight of the Pal- mer's cargo was 10,359 tons and the weighing out weight 10,386 tons. The Olcott unloaded at the Superior dock at Ashtabula, drawing 18 ft.1. in. forward, 18 ft. 1 in. amidships and 18 ft. 3% in. aft. Her bill of lading weight of cargo was 10,085 tons and the weigh- ing out weight 10,134 tons. The dif- ference in these weights, of course, is due to the arbitrary subtraction of 1 per cent for moisture in the bill of lading weight. The Palmer, according to the bill of lading weight, carried 274 tons more than the Olcott and accord- ing to the weighing out weight 252 more tons. Results are tabulated as follows: wid Bs Soe ee ey wea foo 28 24 2 Steamer Tue bao. Se a ce Soe Ore te eae a ea S Gea Polmer... 10,359. 10,386. 18. 18.2. 18.4 Olcott 10,085°° 10,134. 18.1 18:1 18.3% Steamer Perfection Launched The steamer Perfection was launched from the Cleveland yard of the Amer- ican Ship Building Co. for the Stand- ard Oil Co. on May 21. The Perfec- tion is the first of seven vessels build- ing for the Standard Oil Co. to be launched. The American Ship Build- ing Co. is building two steamers and two barges at its Cleveland yard for this company and three barges at the Lorain yard. The Perfection is 260 ft. over all, 250 ft. keel, 43 ft. beam and 23 ft. deep, equipped with triple- expansion engines with cylinders 19, 31 and 54 in. diameters by 42-in. stroke, supplied with steam from two Scotch boilers, 1414 ft. diameter and 11% ft. long, allowed 200 Ibs. pressure. All: of the seven vessels will go into commission during the present season and it is expected that the Standard Oil Co. will Jet contract for a large steamer for lake service during the fall. It is intended that the seven vessels now building on the lakes will go to the coast in the fall.