. The railroad and engineering journal . TRIPLE EXPANSION ENGINES FOR JAPANESE CRUISER CHIYODA. 12 THE RAILROAD AND [January, 189I. worked by a 15 engine, and telephonic communica-tion was established between the face and the office. Thepreparations having been completed, work was begun earlyin 1S84, and trom the hrst great difficulty was experiencedin keeping the chamber air-tight, the compressed air findingits way out not only through the penetrable strata above,but also along the extrados of the roof and the timberstruts required for the support of the ground. It wasonly after building
. The railroad and engineering journal . TRIPLE EXPANSION ENGINES FOR JAPANESE CRUISER CHIYODA. 12 THE RAILROAD AND [January, 189I. worked by a 15 engine, and telephonic communica-tion was established between the face and the office. Thepreparations having been completed, work was begun earlyin 1S84, and trom the hrst great difficulty was experiencedin keeping the chamber air-tight, the compressed air findingits way out not only through the penetrable strata above,but also along the extrados of the roof and the timberstruts required for the support of the ground. It wasonly after building 20-in. buttress-rings on either side ofthe dam that the pressure on the chamber could be broughtup to and 2 atmospheres (absolute), under which con-dition the roof was completed to about 660 ft. from themouth, at the rate of 39 to 48 ft. per month, when thework was stopped by an accident in August, 18S4. Thiswas caused by the compressed air getting into the overly-ing pyritic lignite-bearing strata, and after driving out thewater o
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
