Vlll CONTENTS. 



Page 

 Mr. Shaw on a New Steam-engine worked with three kinds of Pressure, 

 viz. Action of high-pressure Steam, the Expansion of Steam, and the At- 

 mospheric Pressure caused by its Condensation Ill 



Mr. Clegg on a dry Gas-Meter Ill 



Sir M. I. Brunel on the Thames Tunnel in its completed Condition Ill 



Prof. Vigxoles on the Use of Beton and Concrete in constructing Break- 

 waters 112 



Mr. William Brockedon on the Construction of a New Rope employed as 

 a Core in the formation of the Patent Stoppers, a Substitute for Corks and 



Bungs 112 



Sir J. Robison's Notice of Mr. Prosser's Method of making Earthenware or 



Porcelain from dry Powder of Clay compressed 114 



Mr. James Thomson on Wigston's Self-acting Railway Signals 114 



Mr. J. Smith on a New Steam-Boiler 115 



ADDENDUM TO MATHEMATICS AND PHYSICS. 



Mr. S. Russell on the Abnormal Tides in the Frith of Forth 115 



Index 117 



List of Book Subscribers. 



