All About Engines
Forfatter: Edward Cressy
År: 1918
Forlag: Cassell and Company, LTD
Sted: London, New York, Toronto and Melbourne
Sider: 352
UDK: 621 1
With a coloured Frontispiece, and 182 halftone Illustrations and Diagrams.
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I7° All About Engines
wheels or rings of blades. During the next four
years—up to the end of 1888—a number of similar
turbines were built, but none of them was of larger
size than 150 horse-power. In 1889 the Heaton
works of C. A. Parsons and Co. were founded in
order to allow of more and larger turbines being
built under the direct supervision of the inventor.
Unfortunately, at this point there were legal troubles
in regard to the validity of the patents, and Sir
Charles Parsons was not permitted to manufacture his
parallel-flow turbine until 1894. Thus while 60,000
horse-power had been constructed by 1889, the
horse-power produced between that year and 1894
was only 10,000. From 1894, however, the inventor
came into his own.
Nearly every year saw an increase in the power
of individual machines and an increase in their
economy of working. The 150-horse-power turbines
to which reference has been made were constructed
in 1886, and ran at 4,800 revolutions per minute.
The first turbine over 150 horse-power was made in
1891, and the first over 200 horse-power in 1892.
By 1894 500-, by 1899 1,500-, by 1906 6,000-, by
1908 io,ooo-horse-power turbines were at work. The
earlier turbines were non-condensing, and took about
20 lb. of steam per horse-power per hour ; the later
ones, fitted with the most effective air pumps and
condensers, required only about 9 lb.
The general construction of the Parsons Turbine
will be understood from the section given in Fig. 102 on
Plate 12. Steam enters by the two channels, aa, shown