J\ Q 



THE 



STEAM ENGINE: 



ITS INVENTION AND PROGRESSIVE IMPROVEMENT, 



INVESTIGATION OF ITS PRINCIPLES, 



LONDON 



AND ITS APPLICATION TO 



NAVIGATION, MANUFACTURES, AND RAILWAYS. 



BY THOMAS TREDGOLD, CIVIL ENGINEER, 



MEMBER OP THE INSTITUTION OF CIVIL ENGINEERS; AUTHOR OF ELEMENTARY PRINCIPLES OF CARPENTRY; 

 A PRACTICAL TREATISE ON THE STRENGTH OF IRON, &c. 



A NEW EDITION, 



ENLARGED BY THE CONTRIBUTIONS OP EMINENT SCIENTIFIC MEN, AND EXTENDED 



TO THE SCIENCE OP 



REVISED AND EDITED 



BY W. S. B. W O O L H O U S E, F. R. A. S., &c., 



ACTUARY TO THE NATIONAL LOAN FUND LIFE ASSURANCE SOCIETY. 



IN TWO VOLUMES, 



WITH ONE HUNDRED AND TWENTY-FIVE ENGRAVINGS AND NUMEROUS WOOD-CUTS. 



VOL. I. 



LONDON: JOHN WEALE. 



MDCCCXXXVIII. 



