ICE-HOUSES. 



327 



or of asbestos roofing ; but the roof must be perfectly 

 water-proof, and should have broad eaves to shade the 

 walls as much as possible from the sun's heat. The out- 

 side of the building, roof included, should be white- 

 washed, so as to reflect heat. The inside of the building 

 should be lined with good boards placed horizontally, 

 and the space between the two boardings should be filled 

 closely with the packing. If packing material is scarce, 

 air-proof lining, such as is used in the walls of dwelling- 

 houses, may be substituted for it; but the joints in this 

 case should be carefully made, that the outside air may 



Fig. 61.— SECTION OF ICE-HOUSE FILLED. 



be excluded and that within the wall be kept stationary. 

 In figure 61 is shown a section of the house filled with 

 ice; the lining between the walls is shown by the dark 

 shading. The packing around the ice should be a foot 

 thick at the bottom and the sides, and two feet at the 

 top. There should be a capacious ventilator at the top 

 of the liouse, and the spaces above the plates and between 

 the rafters at the eaves will permit a constant current of 

 air to pass over the upper packing, and remove the col- 

 lected vapor. The method of closing the doors is shown 



