

THE STEAM-ENGINE. 



(FIRST LECTURE.) 



The Steam-Engine a Subject of popular Interest. Effects of Steam. Great Power of Steam. 

 Mechanical Properties of Fluids. Elastic and inelastic Fluids. Elasticity of Gases. Effects of 

 Heat. Savery's Engine. Boilers and their Appendages. Working Apparatus. Mode of Op- 

 eration. Defects of Savery's Engine. Newcomen and Cawley's Patent. Accidental Discov- 

 ery of Condensation by Injection. Potter's Invention of the Method of working the Valves. 

 His Contrivance improved by the Substitution of the Plug-Frame. 



