534 



AGRICULTURAL ENGINEERING 



The Sheringham valve makes a satisfactory inlet. This 

 is arranged by hinging the window at the bottom and allow- 

 ing it to drop inward at the top between cheeks or triangular- 

 shaped side pieces. The air in striking the inclined window 

 is thrown upward toward the ceiling and is not allowed to 

 pass directly onto the animals which may be housed in the 

 building. The fresh air is diffused through the room and the 

 foul air passes out through suitable flues, not unlike those to 



be described later. Cowls 

 or cupolas are used in 

 connection with outlet 

 flues and are designed in 

 such a manner that the 

 winds in blowing across 

 them produce a suction 

 or aspirating effect in the 

 flues. 



Temperature System. 

 The principle that heated 

 air rises is the theory 

 basis of the majority of 

 the successful ventilating 

 systems now in use. The 

 King system, named after 

 the designer, the late 

 Professor F. H. King, uses 

 this principle as well as 

 the principle that foul 

 air is heavier than pure 

 air when both are at the same temperature, and tends to 

 settle towards the floor. For this reason, the inlets in the 

 King system discharge pure air near the ceiling and the out- 

 let flues receive the air near the floor. 



Fig. 322 ; Showing one method of ar- 

 ranging trie outlet flues in the King sys- 

 tem. The flues may be brought together 

 to form a common outlet. 



