. The street railway review . ise 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 r. p. m.,and are geared down to abo
. The street railway review . ise 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 r. p. m.,and are geared down to about 3,000; the larger sizes about 10,000 m. The peripheral speed of the wheel is usuaUy from 600 to1,200 ft. per second. The reduction of speed is accomplished bymeans of a pair of helical spur gears with the angle of helix 45 gears form by far the biggest part of the apparatus. Theremaining portions of these turbines have no remarkable regulation is effected by means of a fly-ball governor which is. FIG. 2-SECTION OF WESTINGHOUSE-PARSONS STEAM TURBINE. were reviewed. The want of sufficient space prevents us from giv-ing the whole of Mr. Hodgkinsons paper. The author was asso-ciated with the Hon. C. A. Parsons in England, and since 1896 hasbeen with the Westingliouse Machine Co., at Pittsburg. on the slower running shaft and wire draws the steam at the admis-sion. Some tests of a lo-h. p. turbine were communicated to theAmerican Society of Mechanical Engineers by Professor Goss, in1895. in which the turbine described had four nozzles of .138 in. di- Feb. 15, 1901 STREET RAILWAY REVIEW. 99 ameter and one of .157 in. diameter of throat. Tlie nozzles were 2in. long from throat to outlet. The speed of the turbine was 23,-I r. p. m. reduced by gearing to , the economy full load, non-condensing, was lb. per brake h. p. h. This economy is by nomeans bad when the small power of the outfit is considered. InDecember, 1899, some tests were made in Fran
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