TRANSACTIONS OF THE SECTIONS. 131 



On Warming and Ventilating. By Mr. Jeffries. 



In this communication the author gave a description of a new Pneu- 

 matic Stove. 



Account of a Method of Filtering Liquids. By Mr. Beart. 



The principle of the process recommended by the author is to use a 

 perforated packed piston in a cylindrical or other vessel, so that on 

 raising the piston a partial vacuum is formed, and the liquid is urged 

 to filler through the material used in the construction of the piston, by 

 the pressure of the atmosphere, added to the weight of the column of 

 liquid. The application of this to the making of coflee and other in- 

 fusions was explained. 



Remarks on Bridge Architecture. By Mr. Dredge. 



A new Secret Lock, without a key, by Mr. Benge, was exhibited. 



A model, sent by Mr. Hamilton, of Edinburgh, was explained, of a 

 method by which the resistance caused by the pressure of the wind 

 against the valves of the organ can be overcome, thereby permitting 

 the largest pipes to be played by the fingers with facility, and also ren- 

 dering the movement of pedal keys and valves more smooth. 



On the Scientific principles, geometrical forms aiid proportions, and the 

 constructive skill manifested in the execution of the Cathedrals and 

 other large Churches of the Middle Ages ; with incidental remarks on 

 the symmetry, unity and harmony of ancient ecclesiastical Architec- 

 ture. Illustratedhy numerous Drav.lngs. jBy John BRiTT0N,i^.*S'.y4., 



Ow Percussion Boring of Tunnels. By C. Vignoles, F.R.S. 



On the method of rolling Dovetailed Grooves for Railways. 

 By Wm. Carpmael. 



On a new constructio7i of Wooden Railway Wheels. 

 By Thomas Parkin. 

 The author, after stating the imperfections and liabilities to acci- 

 dental breaking which attend iron wheels of the ordinary construction, 

 endeavoured to prove that wheels properly constructed, chiefly of wood, 

 will be much more secure than those of iron. The author stated that 

 a specimen sent for inspection could not be broken in actual service, 

 however severe. Among other advantages attending the plan he ad- 

 vocated, Mr. Parkhi mentions the facility of widening the tire of the 

 wheels, the better 'bite' of the locomotive on the rails, and the dimi- 

 nished wearing of the rails themselves. 

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