. American engineer and railroad journal . he type usually adopted in war vesselsat the present day, being designed with the object of ob-taining the maximum of strength from a given weight ofmaterial. They are of the triple-expansion type, withcylinders ■^j^i^ in., 49 in., and 74 in. diameter, by 39 , and are required by contract to develop 7,000 the boilers worked at an air pressure of in. ofwater, and 9,000 with an air pressure of in., the Vot. LXVI, No. 2.] ENGINEERING JOURNAL. 77 revolutions at the latter power being 140, and the boilerpressure 155 lbs. per
. American engineer and railroad journal . he type usually adopted in war vesselsat the present day, being designed with the object of ob-taining the maximum of strength from a given weight ofmaterial. They are of the triple-expansion type, withcylinders ■^j^i^ in., 49 in., and 74 in. diameter, by 39 , and are required by contract to develop 7,000 the boilers worked at an air pressure of in. ofwater, and 9,000 with an air pressure of in., the Vot. LXVI, No. 2.] ENGINEERING JOURNAL. 77 revolutions at the latter power being 140, and the boilerpressure 155 lbs. per square inch. There are two engines,each driving one screw. On the trials, which in the cases of all the three shipswere carried out at iortsmouih, these powers were ex-ceeded, in all cases everything working in a uniformlysatisfactory manner, so that no hitch of any kind in themachinery caused loss or delay in a single trial. On the eight hours steam trial with natural draft theengines of the Naiati gave the following averages : Sleam-. Fig. 2. pressure, 153 lbs.; revolutions, ; power indicated,4,251 On the four hours trial with forced draft theaverages were ; 150 lbs. steam ; revolutions ; 9, Over the measured mile the speeds obtained knots with natural draft and knots with forceddraft. The armament carried by these cruisers consists of two6-in. breech-loading rifles ; six rapid-fire guns ;eight 6-pdr. rapid-fire guns ; one 3-pdr. Hotchkiss andfour Nordenfeldt machine guns. There are also fourtorpedo-tubes. « THE SAULT STE. MARIE CANAL TRAFFIC. The comparative statement of the business of the SaultSte. Marie Canal for the season is as follows : 1891. Vessels passed through 10,191 No. of lockages .. 1 4,981 No. of passengers I 26,190 Tons of freight 8,888,759 1890. ■ 14,856 9,041,213 Change. 366 II Inc. 1,334Dec. 152,454 Iron ore showed a decrease in 1891 of 1,012,280 tons, or50 per cent., and the decrease
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
