. Official proceedings . ;^^^. K^wl- x?^ uvN .^stsx>tvxxv i^x-<:^vt TOTAL HEAT CONTENTS (H) PER POUND coniniercially, Imwcvcr, it is necessary to supplement the tur-bine with suitable reduction gearing so that the turbine unit,consisting of turbine and gear, must be. for the sake of com-parison, taken together, when its advantages and disadvantagesare put side by side with the Curtis, Rateau or Parsons turbine. Owing to the high stresses encountered in this type ofturbine the diameters of the wheels are relatively small, and thematerials used exceptionally good. The following tabl
. Official proceedings . ;^^^. K^wl- x?^ uvN .^stsx>tvxxv i^x-<:^vt TOTAL HEAT CONTENTS (H) PER POUND coniniercially, Imwcvcr, it is necessary to supplement the tur-bine with suitable reduction gearing so that the turbine unit,consisting of turbine and gear, must be. for the sake of com-parison, taken together, when its advantages and disadvantagesare put side by side with the Curtis, Rateau or Parsons turbine. Owing to the high stresses encountered in this type ofturbine the diameters of the wheels are relatively small, and thematerials used exceptionally good. The following table gives a good idea of the relative pro-portions of several ditTerent De Laval machines: Horsepower 5 30 100 300 Revolutions per minute 30,000 20,000 13,000 10,000 Diameter to center of blades, inches 886 Blade speed, feet per second 516 775 1,115 1,305 Owing to the high bade speed required in the De Lavalturbine, a substantial blade fastening is required. The bladesare made of drop forged steel and have bulb
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