. The Street railway journal . type,which has proven itself eminently successful in numerous in-stallations both here and abroad. The Allis-Chalmers con-struction, however, embodies a number of features which arenew in this country, and which are claimed by the builders tobe distinct improvements. The chief distinguishing feature of this construction is theblading, which, while it is of the Parsons reaction type as re-gards the principle of operation, differs in mechanical con-struction in a number of essential details. The roots of theblades are formed in dove-tail shape by special machinery,
. The Street railway journal . type,which has proven itself eminently successful in numerous in-stallations both here and abroad. The Allis-Chalmers con-struction, however, embodies a number of features which arenew in this country, and which are claimed by the builders tobe distinct improvements. The chief distinguishing feature of this construction is theblading, which, while it is of the Parsons reaction type as re-gards the principle of operation, differs in mechanical con-struction in a number of essential details. The roots of theblades are formed in dove-tail shape by special machinery, andare inserted in slots cut in foundation or base rings, these slotsbeing formed by special machine tools in such a way as toexactly conform to the shapes of the blade roots. The founda-tion rings themselves are of dove-tail shape in cross section,and are inserted in dove-tailed grooves cut in the turbine cyl-inder and spindle respectively, in which they are firmly heldby key pieces, much in the same way that the well-known. FIG. 2.—ILLUSTRATING THE METHOD OF FASTENING THEBLADES AS WELL AS THE CHANNEL-SHAPED SHROUD RING
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
