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Mr Shaw, On an experiment in Ventilation. [May 10, 



(2) On an experiment in Ventilation. By W. N. Shaw, M.A. 



This paper results from an attempt to improve the ventilation 

 of the Biological Lecture-Room of the New Museums in order 

 to make the room serviceable for lectures to large classes for 

 consecutive hours. 



The room is of the ordinary lecture-room shape, a rectangular 

 room partly filled by raised seats so that the longitudinal section 

 would be somewhat as represented in Fig. 1 ; A,B,G, D being the 



Fig. l. 



rectangular outline and E, F the slope of the line of seats. There 

 are two doors in the North wall near the corners B, C, that near C 

 opening into a passage under the higher seats, represented by 

 HGK. There is another door in the East wall near the corner 

 diagonally opposite to the door C. The room is heated by a row 

 of hot-water pipes cased in wood running along the floor on the 

 South side, immediately under the row of windows in the same 

 wall by which the room is lighted. 



The means of ventilation hitherto provided consisted of two 

 Tobin inlets T, T in opposite corners, and two exhaust ventilators 



V, V. 



The Tobin T in the corner B of the North and East walls 

 is one square foot in area and is supplied by air from the space 

 underneath the floor of the room, communicating with the out- 

 side by a number of open grids. In this space there are numerous 

 hot-water pipe connections so that the air delivered by the 

 Tobin is warmed, and enters the room at a temperature of about 

 80° F. 



The other Tobin, in the opposite corner where the passage 

 turns to enter the room, is about 12" x 13" in area and com- 



