314 WAKMING AND VENTILATING OCCUPIED BUILDINGS. 



Barracks : 



During the day 1, 059 



At night 1, 413-1, 7G6 



Theaters 1, 413-1, 766 



Assembly-rooms and halls for long receptions 2, 119 



Halls for brief recejjtions ; lecture-rooms 1, 059 



Primary schools 42-4, 530 



Adult schools 883-1, 059 



Stables 6, 357-7, 063 



These amounts, much larger than those deemed necessary a few years 

 ago, are not at all excessive, and are for the most part based on direct 

 observations.* 



In manufactories and other buildings, where the number of persons is 

 not very large, but where other causes may affect the air, the amount 

 to be withdrawn should be determined by the condition that the air in 

 each of these places should be completely changed a certain number of 

 times an hour. Thus, for dwelling-rooms, this change should take place 

 about four or five times an hoar. 



We will specify further on the proportions to be adopted in some 

 other particular cases. 



41. Proper temperature. — In well-ventilated places, with a constant 

 change of air, higher temperatures can be easily borne, and even be 

 found pleasant, than those which would be found oppressive where the 

 air is not changed. Nevertheless, the internal temperature should not 

 be kept above the following points : 



Nurseries, asylums, and schools , 59° 



Workshops, barracks, x)risons 59° 



Hospitals 610-640 



Theaters, assembly-rooms, lecture-halls 66°-68° 



The fresh air introduced should generally have about the temi3era- 

 ture it is desired to maintain in the room as soon as this is sufficiently 

 warmed. 



If, however, the room has large glass surfaces which cool the air, if 

 there are not many occupants or lights, the fresh air should be warmer, 

 and its temperature may be as much as 86° or 95°. 



If, on the other hand, there are many lights burning and large gath- 

 erings, the temperature of the fresh air should be a little less than that 

 of the room itself. Trial will readily determine the proper temperature 

 in each case. 



42. Means of regulating the temperature of the fresh air. — During the 

 period of artificial heating, it is proper to reserve means of mixing with 

 the warm air supplied by the heating-apparatus cool air, the amount of 

 which mtry be regulated by convenient registers. For this purpose the 

 warm air supplied by the heating-apparatus should be received in a 



* Etudes sur la yeutilatiou, 1 er vol. 



