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140 STEAM-TURBINES.
3. Rate of flow, by weight, reaches a maximum when the final pressure is from about 0.85 to 0.50 times the absolute initial pressure. 4. The maximum rate of flow from the sharp-cornered orifice occurs after a somewhat greater reduction of back pres- R R- H R PE E R D G S A B A M Apparatus used by Mr. George Wilson, for determining reaction due to steam flow from orifice at 11. (Reproduced from London "Engineering," 1872.) sure than is required with the rounded orifice to bring about the maximum rate of flow. 5. The addition of a divergent nozzle to the orifice seems to cause the maxinium rate of flow to occur earlier—that is, after less reduction of back pressure-than is the case with the simple orifice.
