278 WARMING AND VENTILATION. 



It should be added that, without urging the ventilatiog-iire, it is easy, 

 with the proportions adopted, to increase the amount of air removed to 

 more than 88,000 cubic feet an hour. 



In conclusion, we see from these experiments that the dimensions 

 adopted in this first application to infant-asylums are much larger than 

 necessary, and that the results intended have been more than realized. 

 It may then be considered certain that in making similar arrangements, 

 even with smaller dimensions, all requirements for good and complete 

 ventilation will be satisfied at an expense much less than that incurred 

 in the asylum which the parish of Saint Ambrose owes to its venerable 

 curate, M. Langenieux. 



GO. Proportions for an asylum of fifty cradles. — According to the 

 results of the experiments which have just been mentioned, and the 

 conditions of service imposed by the regulations, the arrangements 

 adopted by the Saint Ambrose Asylum greatly exceeding the necessities 

 of the case, the following data may be assumed for a similar asylum : 

 Amount of air to be carried off and replaced for 50 



children, at 530 cubic feet each per hour 2G, 500 cubic feet. 



For attendants and visitors 8, 800 cubic feet. 



35, 300 cubic feet. 



Floor room, IQ^ feet to each cradle - 812 square feet. 



Interior height 13 feet. 



Total cubical contents 10, GOO cubic feet. 



Equivalent to 212 cubic feet to each cradle. 



The air of the room should be changed ' =3^^ times an hour. 



The volume of air to be carried off and replaced in a second would be 

 35300^gg ^^^^.^ ^g^^_ 

 3G00 



From these data, following the preceding rules in the calculation of 

 the dimensions of openings and flues, all the expenses of founding and 

 carrying on the establishment will be kept within narrower limits than 

 those which have attended its first application. 



PRIMARY SCHOOLS. 



61. The plans adopted should be designed to carry off and replace a 

 volume of 400 to 500 cubic feet an hour for each child. 



The ventilating-openings should be placed in or against the vertical 

 walls of the two long sides of the room. It is only in case of great con- 

 structive difficulties that they may be confined to a single side. There 

 should be as many of them as possible, and they should have a clear 

 cross-sectional area that will give to the air carried off a velocity of more 

 than 28 inches a second. Tliey should connect with descending flues 

 leading in the cellar or under the floor to a collecting-pipe, which, in 



