. Every boy's book of railways and steamships . a scientificdevelopment of the apparatus with which Hero ofAlexandria experimented more than 2000 yearsago. In the turbine there is a cylindrical-box con-taining a spindle mounted with a number of metaldiscs, which have vanes set slantingly at theircircumference. When steam is admitted to thecylinder, it acts upon the vanes very much in thesame manner as the sail vanes of a mill are actedupon by the wind, or the buckets of a wheel forcedround by water. From the point where the steamis admitted, the vanes and wheels increase in size,and so the exp
. Every boy's book of railways and steamships . a scientificdevelopment of the apparatus with which Hero ofAlexandria experimented more than 2000 yearsago. In the turbine there is a cylindrical-box con-taining a spindle mounted with a number of metaldiscs, which have vanes set slantingly at theircircumference. When steam is admitted to thecylinder, it acts upon the vanes very much in thesame manner as the sail vanes of a mill are actedupon by the wind, or the buckets of a wheel forcedround by water. From the point where the steamis admitted, the vanes and wheels increase in size,and so the expanding steam finds a greater surfaceupon which to exert its force; and steam whichenters the cylinder at a pressure of 200 lbs. persquare inch, leaves it at a velocity of about three-quarters of a mile a second, or quite two-thirds ofthe speed of a bullet shot from a modern Parsons turbine of 1884 attained a speed of18,000 revolutions a minute. A turbine engine is not more than half theweight of the ordinary reciprocating engine; and.
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Keywords: ., bookcentury1900, bookdecade1910, bookidever, booksubjectrailroads
