Ventilation with Heating. 85 



first place, by mere ventilators with swivelling cowl heads, or by 

 fans, and again others by pressure, that is air compressing engines 

 drawing the air from some place where it is dry, and passing it 

 at a considerable pressure through small pipes, which discharge 

 through special nozzles in the ventilators to induce a current of 

 air either in or out. All these have their faults. The last is 

 undoubtedly the best, but it is noisy. In the case of fan venti- 

 lation, the risk of having so many water-tight doors where each 

 trunkway passes through the water-tight bulkheads (which in 

 case of collision or emergency would have to be closed) would 

 be very considerable. As to Mr. Workman's point with reference 

 to warming the air, and getting rid of vitiated air, the mode as 

 described by him seems to be the correct principle, except in the 

 case of a very high apartment. 



Mr. Gray said: — As to the question of getting rid of vitiated 

 air, we must remember that the vitiated and the pure air will 

 necessarily mix, and the point is ; — When you make an 

 arrangement for the heating of rooms in certain seasons and 

 limited to certain conditions, will the same apparatus promote 

 the ventilation of the same apartment under different condi- 

 tions 7 Will the arrangements for ventilation in winter answer 

 the same purpose in summer when the air is heated by the 

 temperature outside } 



Mr. Conway Scott said : — I was not in at the beginning 

 of the paper, but from what I have heard I think there 

 is a good deal in it. I do not however like the idea of the 

 upper portion of a room being hermetically sealed, and [ think 

 difficulty would be felt in hot weather. In any system of venti- 

 lation we should look at both the extreme cases, the winter and 

 summer. I like the paper very much, but I cannot express an 

 opinion on the subject at present. 



Mr. W. Workman said : — Mr. Conway Scott. I think, mis- 

 understands the theory I have been trying to put forward. If 



