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Page:Popular Science Monthly Volume 12.djvu/271

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THE

POPULAR SCIENCE

MONTHLY.

 

JANUARY, 1878


 

THE GROWTH OF THE STEAM-ENGINE.[1]
By Professor R. H. THURSTON,

OF THE STEVENS INSTITUTE OF TECHNOLOGY.

III.

THE NON-CONDENSING ENGINE, AND ITS APPLICATION IN THE LOCOMOTIVE.

PSM V12 D271 Steam engines of hero and branca.jpg

45. The engines of Hero and Branca were, it will be remembered, non-condensing; but the first plan of a non-condensing engine that could have been made of any really practical use is given in the "Theatrum Machinarum" of Leupold, published in 1720. His sketch is copied in Fig. 23. It is stated by Leupold that this plan was sug-

  1. An abstract of "A History of the Growth of the Steam-Engine," to be published by D. Appleton & Co.