ARTIFICIAL INCUBATION. 



1015 



sensitive regulators of any incubator known. It is certainly as pre- 

 possessing in appearance as any machine of the kind yet invented. 

 Fig. 1368 is the regulator. A, C, is a glass siphon gauge, connected 

 at B with the heated water A, which extends nearly to the bottom 



Fig. 1367.— The Boyle Incubator. General View. 



of the longer leg of the siphon, pressing on the mercury C, connected 

 by the tube D with the glass tube E, which expands to the end' of 

 the cup F, which is connected by a wire, with the lever H, K, moving 

 on a fulcrum I, and is carefully balanced by a weight L. It is also 

 balanced by a spring G. 



The indicator itself is arranged as shown in Fig. 1369. Portions 

 of cotton wool are placed in small holders Q - up the center of the 

 egg plate, under which airis.fr/dely admitted, keeping the surface 

 cooler than the top. Rows of eggs are placed under arches in the 

 heating-tank P, connected by a pipe Q with the boiler. The 

 eggs; as soon as chipped, are hatched out into the hatching-box R 

 on top of the heating-cistern. The column of water A in the 

 regulator is connected with that part of the boiler which is in con- 

 tact with the flame. 



There was a great advance in the. success of incubators after the 



