It is not necessary to have a vent to " let off " warm air. as the ice " uses up " 

 the warm air in melting, and any opening only melts the ice faster by letting in 

 warm air. The sole need of ventilation is to provide pure, fresh air for the pro- 

 visions, and this is got by washing out the inside occasionally, using good washing- 

 lowder. letting refrigerator stand a few hours with doors open to dry well and 

 sweeten. 



i 



The above type may be made in larger sizes on the same principles. In erect- 

 ing a refrigera ting-room, partition off ice-chamber with sufficient insulation that 

 the warm ar. rough a small space to the top of the ice-chamber, and the 



cold air is carried toward the bottom of the provision-chamber. This sets up air 

 currents that are more lively and effective. 



12 



