CONTENTS. XV 



Page 



Mr. William Hooper on the Electrical and Mechanical Properties of Hooper's 

 India-ruhber Insulated Wire for Submarine Cables 145 



Mr. G. O. Hughes on Rotary Enffines, with special reference to one invented 

 by W. Hall 145 



Mr. Fredebick Ingle on recent Improvements in the Application of Con- 

 crete to Fireproof Constructions 145 



Mr. Fleeming Jenkln on a New Arrancrement for pickino: up Submarine 

 Cables f 145 



Mr. Samuel J. Mackie on Zinc Sheathing for Ships 146 



Mr. R. MusHET on the Treatment of melted Cast Iron and its Conversion into 

 Iron and Steel by the Pneumatic Process 147 



Prof. W. J. Macquoen Rankine on the Theory of the Influence of Friction 

 upon the Mechanical Efficiency of Steam 147 



; 's Remarks on the Experiments of the Com- 

 mittee upon the Resistance of Water to Floating and Immersed Bodies. . . . 147 



Captain Wynants on Barytic Powder for Heavy Ordnance 148 



