INCUBATOR HOUSES AND CELLARS 



329 



A building put up expressly for incubation purposes need not 

 be very expensive; but a few requirements must be provided 

 (Fig. 156, A, B, C, D). The floor should be from four to five feet 

 below the level of the ground, and the ceiling from eight to ten 

 feet high, giving about five feet below ground and five feet above. 

 Double walls, especially above the ground, are essential, as they 

 aid materially in keeping the temperature uniform. The subgrade, 

 or wall below the ground, is best constructed of poured concrete 



FIG. 156. Four views showing construction of hollow-tile incubator cellar. A, Forms 

 ready for pouring concrete foundation wall; B, forms removed; C, hollow-tile construction 

 and manner of framing roof; D, completed cellar. 



or stone (Fig. 81), while the side wall above ground can be made 

 of lumber, 2 x 4 inch studding, sheathed inside and out. Or 

 it 'can be constructed of hollow tile, which has proved satisfactory, 

 as it is almost a non-conductor of heat. Such a tile, well stuccoed 

 inside and out, is economical, durable, easily built, not susceptible 

 to temperature and moisture variations, and can be quickly and 

 easily cleaned. 



The building should have a loft overhead, to insure uniformity 

 of temperature. For this purpose, a two-pitch or gable roof is 

 best, and it is advisable to put in heavy ceiling rafters and a solid 

 board floor, so that the loft can be used for storage purposes. 



Ventilation. It is unnecessary to install an expensive ventilat- 



