. The street railway review . The following is abstracted from Mr. Hodgkinsons paper:Steam turbines may be divided into three classes: i. Reaction,of which Heros, described about 120 B. C, is an example. constructed a turbine of this type which with a steam pres--Hure of 100 lb. per sq. in. at the jets and a 26-in. vacuum ran r. p. m, and developed 20 h. p. on 40 lb. of steam per brake h. 2. Impact, of which Biancas, invented in 1629, is an was the forerunner of the de Laval FIG. 1-DELAVAL TXtRBINE. FIG. 3-GOVERNOR LEVERS. Tests of a 200-kw. turbi
. The street railway review . The following is abstracted from Mr. Hodgkinsons paper:Steam turbines may be divided into three classes: i. Reaction,of which Heros, described about 120 B. C, is an example. constructed a turbine of this type which with a steam pres--Hure of 100 lb. per sq. in. at the jets and a 26-in. vacuum ran r. p. m, and developed 20 h. p. on 40 lb. of steam per brake h. 2. Impact, of which Biancas, invented in 1629, is an was the forerunner of the de Laval FIG. 1-DELAVAL TXtRBINE. FIG. 3-GOVERNOR LEVERS. Tests of a 200-kw. turbine generating unit when developing 300 showed a water consumption of about lb. of water per hourrunning condensing. Since that time there have been important improvements made inthe matter of increased capacity and the announcement that a 3,000-h. p. turbine-generator unit is now being installed at the powerhouse of the Hartford (Conn.) Electric Light Co. will doubtless bea surprise to those who have not closely followed the recent in this field. On December 20th, Mr. Francis Hodgkinson read a paperbeforethe Engineers Society of Western Pennsylvania on Steam Tur-bines, in which the history and present state of this type of motor 3. A combination of reaction and impact of which the Parsonsturbine is an example. The de Laval and the Parsons turbines are the types that havebeen developed commercially. The de Laval turbines are essentiallyof very high speed. The smaller sizes run about 30,000
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