. Official proceedings . g speeds are too hij^h tomake use of directly. If, now, we should subdivide this simpleturbine element into a nuniber of steps each consisting of asmall section of the nozzle with its bucket wheel, we find thatit is no longer necessary to remove all the velocit\ and energyof the steam in one step. They may now be distributed be-tween these several steps or stages, in each of which the steamvelocities will be much lower. This process is called compoiDid-ing and has been attended with the most success in the Parsonstype. It resembles to a certain extent the principles of
. Official proceedings . g speeds are too hij^h tomake use of directly. If, now, we should subdivide this simpleturbine element into a nuniber of steps each consisting of asmall section of the nozzle with its bucket wheel, we find thatit is no longer necessary to remove all the velocit\ and energyof the steam in one step. They may now be distributed be-tween these several steps or stages, in each of which the steamvelocities will be much lower. This process is called compoiDid-ing and has been attended with the most success in the Parsonstype. It resembles to a certain extent the principles of com-pounding used in steam engine practice of today. In the presentWestinghouse-Parsons type steam velocities have been reducedby means of this principle fron-i the maximum of 4,000 feet persecond to a maximum of 600 feet per second. This is so lowthat commercial running speeds are obtainable with the bestefficiencies. Furthermore, wear of the vanes from water in thesteam is almost entirelv avoided at this low Sectional Elevation of a Tj-pical Westinghouse-ParsonsSteam Turbine. 114 Proceedings Railway Club of Pittsburgh. Construction of the Wcstinghousc-Parsons may now look into the construction of a modern tur-bine of the Parsons type. The two accompanying cuts showthe section and exterior view of a typical machine of Westing- <: ^ c
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