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. — 

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



