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THE GROWTH OF THE STEAM ENGINE.
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scribed, in a work published at Rome, a number of ingenious mechanical contrivances, among which was a steam-engine (Fig. 5), in which the steam, issuing from a boiler, impinged upon the vanes of an horizontal wheel.
This it was proposed to apply to many useful purposes.
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Fig. 4.—De Caus's Apparatus, a. d. 1615.
12. In illustration of the singular manner in which old inventions disappear only to reappear in latter times, it may be remarked that this contrivance was brought forward quite recently by a sanguine inventor, who spent a considerable sum in building what he considered a great improvement upon existing forms of steam-engines.
The engine of Hero also has been frequently reinvented, and, un-