29-2 



AMERICAN POMOLOGY. 



thickly painted, and nailed to upriglit studding. The 

 outer casing in some houses is made of brick. The inside 

 of the brick wall is covered with roofing cement, or pitch, 

 or some other air-tight- coating. {JK K) doors G or 8 

 inches thick, filled with chaff or sha,vings, and fitted 

 tightly to the door-frames, by listing or cloth nailed over 

 tiiin layers of cotton. (X) The ice-chamber, (i) Joists 

 to support the ice floor, resting 2 inches on the posts at 

 Q. {If) Iron bars, Ij inches wide, and I inch thick. 



Fig.28. — NTCE'S TBUIT PRESEBVUIO HOUSE. (LONOITDDINAL SECTION.) 



gained | inch into the joists, and placed crosswise to them. 

 A bar must always be put directly under the seams and 

 rivets. Three bars are enough to be under a sheet 30 

 inches wide. (M) The galvanized-iron ice floor, No. 18 

 or 20 ; the edges joined with rivets not more than 1 inch 

 apart, and very carefully soldered. The ice floor is put on 

 the edges of the iron bars so as to expose eveiy part of 

 itrt surface, on which ice directly rests, to the air of the 

 room below. {S) Sides of ice room made of upright 



