EXPERIMENT STATION BULLETINS. 



189 



VENTILATOKS .V^D VENTILATING MACHINES. 



The houses are arranged with ventilators on each side of the roof. 

 Three of these rows of ventihitors are hinged at the ridge, each sash being 

 5 feet 2 inches by 2 feet 2 inches. The other row consists of narrow sash 

 extending from the ridge to the gutter. On one side of the east house 

 there are five of these sashes, each 16 inches by 11 feet 3 inches. These 

 are designed to lift up by means of iron levers so that they will stand from 

 four to six inches above and parallel to the line of the roof. They will 

 seldom be needed during the winter, but for summer ventilation I shall 

 expect to find them very efficient. The other three rows of ventilators 

 have been used to test various ventilating machines, tn all cases appa- 

 ratus for 

 the methods of applying the power. 



The ridge ventilators are attached to elbow joint fixtures that are con- 

 nected with a shaft of one-inch gas pipe running through the house just 

 under the ridge. This enables us to raise at the same time all the ventila- 

 tors that are attached to the shaft. 



The three machines tested the past winter were the Evans, Hippard, and 

 ScoUay. They all have their advocates and are perhaps as good as any 

 ventilating machines manufactured. The Evans Challenge machine is 



raising the windows is similar, but there is a great difference in 



(Fig. 12.— Evans Challenge Ventilating Machine. 



