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MARINE REVIE e irate XVI. A Most Economical Compound Engine, THE KALIYUGA'S ENGINE DEVELOPES 704 HORSE POWER ON A COAL CON- SUMPTION OF 1.86, AFTER BEING FITTED WITH THE HOWDEN HOT DRAFT. = Tt is somewhat of a revelation to learn that a compound engine built ten years ago, can be made more economical and as efficient as a. number of triple expansion engines of more modern type. When the St. Clair Steamship Co. contracted with the Dry Dock Engine Works for the equipment of the Howden system of hot draft, they had studied the matter so thoroughly that they knew what todemand. But when it was known that they required a coal consumption equal to that of most of the triple expansion engines, prominent engine builders said it could not be done, and that the contractors would fail. The require- ments will make the results shown in the report interesting, and the fact that the test was made for the owners of the Kaliyuga gives an addi- tional value to it, as it is believed to be the first test made on' the lakes when two parties were represented. The requirements were as follows: Minimum h. p. 700. Coal consumption 2.25. The results ob- tained were: = Minimum h. p., 704. Coal consumption 1.86. 941. Coal consumption 1.92. Maximum h. p. It is not mentioned in the report that rs ; ' Cylinder 22X45 &#3Rev 802 ~ Steam /20 VAR Oo ' Soate fa* [ee aoe ee reat ene nea Oia: Saenger ee! wate Srtsl t t M.E.RP ae. See CLE 1 \ Ss SS ( 2 72 a Se ' ELAS BS oe / -- ~ Nit. x eee f-- oe ea | weg ean" we AK Cc ¢ 4u6 "as ' t Ne Al ' = iN ~~ A 1 ° 1 ere - 1 | ~ - ' ween Sew be s/eu savers 1 ' PPS a ! Wo GE. ek eee \ tt "a t \ 17 oh Pie 1S 1 wie = é \ oo m= er, =- ' 4 1 = a = See 7 Nee: : Y- - / On ' / 4 \ ( \ elt RGAE 7 \ S24 2 o4 TO mr ze - ee eK ee -2e08"7~"-" Totaclu.PR 954 FULL POWER CARDS. the Kaliyuga was towing the Fontana. The steamer's cargo consisted of 2,221 tons and the barge's 2,207 tons, maxing a total of 4,428. Fig- uring both cargoes it is found that the coal consumption per ton cargo per mile is .035 pound, or .56 ounce. The average consumption of three of the most modern lake steamers per ton per mile is .064 pouds, and that of what was considered the most economical is .052 pounds. This May sound revolutionary after the advent of the triple expansion engine, but it is a fact nevertheless. The Review is not at liberty to publish the Kaliyuga's fuel con- sumption before the Howden draft was added, but the saving in fuel for the season would make a very nice dividend on the valuation of the Steamer, The owners are to be congratulated on their judgment in making such requirements, and the Dry Dock Engine Works staff should be complimented for meeting them. The report by Mr. Robert Logan follows: "Messrs, Calder and Mattsson represented the Dry Dock Engine rks, and myself the St. Clair Seamship Co. This gave us a staff of Operators, so that the scope of the tests was nescessarily limited Wo CLEVELAND, O., JULY 15, 1897. oath Bae and confined cheifly to ascertaining if the contract stipulations have been obtained, viz: a minimum of 700 H.P. under ordinary working conditions with a maximum consumption of 2.25 lbs. of. Eiisbote 'run of mine" coal per I.H.P. per hour,"' 'The tests were begun at 10 p.m. on the 4th of . uly, ; levine? Detour, and continued without intermission until 4 a. m. of the next -- day, but previous to starting the tests the vessel was stopped at Detour, the air pump examined and one of the bucket valves which we oie broken was replaced. This opportunity was also taken to "blow"' the boiler tubes." "The engines were run during this trial onl as the engineer usually sets them for running with the vessels loaded, except that we used slightly more injection water than he does, a ohana which did not improve the results as we afterwards diccare moi wy - "Indicator cards were taken every half hour and other particulars: - pated at same time; the coal was weighed into the firehold in 200 lb. No. 3. ne lots and carefully tallied? the ashes were not weighed nor taken into account, and the fires were in the same condition five minutes after te: the rie as they were at the commencement." 03.0% MINIMUM POWER CARDS. "The particulars of the machinery are as follows: i Diameter of Cylinders. ee HP oy 2 ee Ratios of Cylinders.........7... 1 to 4.398. ae Strokes: ¢ 720"). ee eer ness _. 45 inches. ne : Piston: OOS Neue - Dene 43/' diameter. : Main, Boiler; 46.3 e veer eee 19/ 6" diameter x 12" 0" long. Working pressure.............. 130 Ibs. ie sate HWS COS: oe oleae ie eae 2 at 46/7 diameter. vim i Grate surface. 226.0 1 ee nee 42.2 sq. ft. : "The mean results of the 6 hours' run and the 13 sets of indicator cs cards were as follows:"' aes [Continued on page Io.] 2E 2 > 1. Steam preSSUre...2..eesseseccecensencrsons i? to 120 Ibs. 2. Receiver pressure... + .2-sp-erescernneeeges 12 lbs. 3. Vacuum (by guage).....--.--eceeee essences 25.25 inches, 4, High Pree eylmdas mean pressure,...--- 63.8 lbs. : 5. Low nS an eee 10-8.