546 THE MECHANICS OF VENTILATION. 



I know, my experiments are the first to shoAv, by actual demonstration, that 

 this view is correct. 



In another paper, I propose to treat of the respiratory sense much more 

 fully, and to review the literature of the subject. Man}- interesting and 

 important points will undoubtedly be involved in a full discussion of the 

 nervous mechanism of the respiratory movements, and among them will 

 be the question as to whether the normal respiratory movements be actually 

 reflex in their character, as has been generally supposed, or whether they 

 be due to a direct excitation of the nerve-cells in the respiratory centre. — 

 J^ew York Medical JournaL 



THE MECHANICS OF VENTILATION- 

 BY GEO. W. RAFTER, C. E. 



(CONTINUSB.) 

 :;< '^ >i< '!- H< ♦ '\^ ;K -> 



In order to farther illustrate the theory of ventilation as above set 

 forth, a numerical application will also be made to the Assembly room in 

 the city building of the City of Eochester. 

 Preliminary data is as follows : 



Length =108' 0" 

 Breadth= 78' 0" 

 Height = 27' 0" 

 Floor area, with an addition for stage =8831 square feet. 

 Total volume, including stage, without deduction for furniture, kc. 

 =244,949 cubic feet. 



The seats now in place accommodate comfortably 1,200 people, with 

 standing room for 400 more. Total capacity is therefore taken at 1,600. 

 Deducting one-half cubic foot for each seat, and 3 cubic feet for space actu- 

 ally occupied by each person, and making other deductions for cornices, 

 raised floor at sides and ends, projection of stage into room, etc., and we 

 have an available volume of 230,500 cubic feet. 



Under the above conditions the floor area for a single person will be 

 8831 



=5.52 square feet ; 



1600 

 while the volume for each person will be , 



230500 



=144 cubic feet. 



1600 

 Lighting apparatus consists of 112 gas burners, each consuming 4 cubic 

 feet of gasper hour. The consumption of gas per hour, then, is 112x4= 

 448 cubic feet. 



As previously shown a cubic foot of gas in lurning produces 0.43 cubic 

 feet of carlonic acid. Production of carbonic acid per hour from combus- 



