THE PEOPLE'S PRACTICAL POULTRY BOOK. 



159 



advantage of the natural law, which, without trouble, gives him always a 

 temperature of one hundred and twelve degrees, and then provides for 

 changes by giving more or less of heating surface. 



THE AMERICAN INCUBATOR. 



This incubator, represented by the cuts ; figure 4, representing the out- 

 ward appearance of the machine, and figure 5 the inside arrangements, 

 was awarded the first premium at the Pennsylvania State Poultry Ex- 

 hibition, held in the city of Philadelphia. 



C, figure 5, is the nursery for young chickens for the first week after hatch- 

 ing, D being a ventilator, of which there is a corresponding one in the rear. 

 B, B, B, B, is the boiler, by which the heat is generated by means of a lamp 

 L. N, N, N, N, are the nests or drawers for the eggs. The two lower 



FIG. 4. 



FIG. 5. 



THE AMERICAN INCUBATOR. 



ones being directly under the boiler, the heat is applied above the eggs, the 

 same as in natural incubation. To apply the heat in the same manner to the 

 eggs in the upper drawers, the inclined shelves, R, R, are used, (the. two 

 drawers being tight-bottomed also.) The heat is thus forced to ascend as 

 shown by the arrows, and passes over the eggs, escaping by the ventilators 

 at H, H, into the nursery, C, where it is again utilized for the young chicks. 

 V, V, are tubes going through the boiler, serving for stays to keep the 

 boiler from bulging or collapsing, and also answering for ventilating the 

 lower tier of drawers. The boiler is so constructed as to keep the water iu 

 constant circulation, thus securing, as is claimed, a uniform heat in all 

 portions of the boiler, with a smaller consumption of fuel than by any other 

 method. 



The great trouble in hatching machines heretofore presented to the 

 public, has been the impossibility of keeping the drawers below the boiler at 



