HELPS IN HATCHING SEASON 65 



Figure 70 gives a general idea of what is to be 

 made. A side sectional view showing the internal ar- 

 rangement and construction is shown in Figure 71. 

 The egg drawer is at e, the heater box at h, the sawdust 



L 



FIG 71 : SECTION PLAN OF INCUBATOR 



filling to retain heat at ^ s s and the ventilator box is at 

 b, filled with sawdust up to the dotted line. 



Use well-seasoned matched pine boards one inch 

 in thickness for all parts except the sides and ends of 

 the egg drawer, which should be a quarter of an inch 

 heavier. 



FIG 72 : INCUBATOR DRAWER AND HEATER 



The heater is made first and is shown at a in Fig- 

 ure 72. It is three feet by four feet and six inches 

 high. It takes two boards six inches wide and four 

 feet long for the sides ; and two boards six inches wide 

 and two feet ten inches long for the front and back ; 

 the top, being made of matched boards nailed on very 



