172 



In the cross section diagram, the inlet is shown by arrows 

 running from A to C. The outlet begins at B and the fowl air goes 

 up the tube and out at E. Both inlets and outlets occur on each side, 

 and should be at intervals of about 10 feet, say 3 of each on each 

 side. Where these numbers occur, then each inlet and each outlet 

 should have a cross sectional area of at least 60 square inches, say 4 

 inches x 15 inches., Where it is intended to install this system, it 

 should be provided for when building the walls. Spaces between 

 the studs will serve for both inlets and outlets. 



The outlet B L E might be modified to take the course B L M, 

 in which case it would probably be necessary to extend M above the 

 level of the apex of the roof. At O openings should be made into 

 the outlets so that the warm air at the ceiling may be allowed to 

 escape when the average stable temperature rises too high. 



The chief objection to this system is the large number' of long 

 pipes or boxes necessary to admit pure air, or discharge foul air, 

 as the case may be. 



This objection is particularly in evidence when it becomes 

 necessary to install the system in an old building. A modification 

 of the system and one that is easy of introduction in an old or new 

 wooden building is given below. 



SYSTEM OF VENTILATION ' E.' 



This system, a modification of the King, permitting of cheap 

 ,and easy installation in either new or old frame or log buildings, 

 is one which the writer devised and put into operation some years 

 ago at the Experimental Farm and elsewhere. It has worked very 

 satisfactorily, wherever installed. That it is cheap as well as 

 effective is proved by the fact that in a stable for 22 cattle it cost 

 $12 for labour and material. The pipes in this system are entirely 

 inside the stable. For 20 cattle in the standard stable these shoulj 

 be six in number, each about 12 inches x 6 inches or 12 inches x 

 7 inches in cross section, 3 on each side (east and west sides if 

 possible). 



Each ventilation pipe must 'have two openings to the outside aii, 

 one an inch or so below the ceiling level as a and b, and the other 

 6 inches to 8 inches above the floor level as c and d. These open- 

 ings should be of the same dimensions as the pipes. The air enters 



