ADVERTISEMENT. 



THE work of Tredgold on the Steam Engine, from its first appearance 

 in the year 182/ up to the present time, has maintained the highest 

 reputation, both in this country and on the continent. Since the pub- 

 lication of the first edition, the boundless resources of steam power 

 have been directed, on the most enlarged scale, to almost every im- 

 portant purpose of mankind, and the steam engine has achieved the 

 greatest triumphs of human ingenuity. The present edition contains 

 several valuable contributions from professional gentlemen of acknow- 

 ledged ability and experience; and, with these and the many revisions 

 and additions which the work has undergone, it is hoped that it will be 

 found suited to the present advanced state of the science, and that it 

 may continue to occupy the same favorable position which it has hitherto 

 enjoyed. A considerable number of errors have been corrected which 

 appeared in the first edition; and, amongst many other improvements, 

 the principles of parallel motion, so important to the manufacturer, 

 have been put in a complete form. 



The Appendix consists of the following original papers : 



I. On the practical nature and general management of marine boilers, 

 by Mr. DINNEN. 



