158 



THE PEOPLE S PRACTICAL POULTRY BOOK. 



THE INCUBATOR BEING OF A CIRCULAR FORM, 



the bottom of these drawers are of perforated zinc, and partly filled with 

 sand, both to preserve the heat and to form a convenient and warm recep- 

 tacle for the newly-hatched chickens. Curtains are provided to surround the 

 sides of the incubator, and thus guard, in some measure, against change of 

 temperature in the apartment. In using this incubator the egg-drawers E 

 are partly filled with chaff or other similar material, on whicli the eggs are 

 deposited. The water from the cold water cistern F, underneath them, slowly 

 evaporates with the heat above, and preserves a gentle moisture around the 

 eggs during the process of incubation, percolating as it does through the 

 chaff and perforated bottom of the egg-drawer ; ventilation takes place 

 through the middle shape or pipe H. Sprinkling the eggs is not necessary in 

 Mr. SCHRODER'S plan ; all that you need to do is to replenish the cold water 

 tank F when exhausted. The eggs, however, as in all incubators, should be 

 withdrawn, cooled half an hour and turned every day. 



THE INCUBATOR OF COL. STUART WORTLEY, 



represented in figure 5, is described by Mr. WRIGHT in his work as superior 

 to all the rest ; but, at the same time, admits that it has not yet been gen- 

 erally tested. D, is a saddle-backed or other convenient boiler, furnished 



.....V 



FIG. 5 COL. STUAKT WORTLEY'S INCUBATOR 



with a steam dome, by which the steam is collected and allowed to escape. 

 Connected with the boiler is a simple cistern C, by which the hight of the 

 water is always kept uniform, a glass gauge, A, showing the hight at a glance. 

 The water in the boiler is always kept boiling, and circulates therefore at a 

 uniform temperature through the pipes, which heats the egg chamber. 

 These pipes pass through padded holes, and hence by sliding them in more, 

 there is greater heat imparted for cold weather, or by withdrawing them a 

 little the temperature will fall. 



THE GREAT IMPROVEMENT OF COL. WORTLEY's INCUBATOR 



is the control he has over the variations of temperature. He seems to take 



