ARTIFICIAL INCUBATION 



1017 



Fio. 1371.— Tomlinson's Automatic Incubator. Second Section. 



ing with vertical 

 flues at the back. 



The regulator of 

 Tomlinson's ma- 

 chine is shown in 

 Fig. 1373. It de- 

 pends upon the ex- 

 pansion of air, and 

 consists of a glass 

 tube sealed at both 

 ends, with a cup- 

 shaped opening on 

 the under side, 

 closed by a dia- 

 phragm of India rub- 

 ber tied tightly around its lip after the temperature is brought 

 to 90°. When the air expands, the diaphragm swells out and 

 presses down 

 the button at 

 the end of the 

 lever, and so 

 lifts the valve 



connected with \LA ' . ^^Ki^ e 



the egg-drawer, 

 and allows the 

 hot air to es- 

 cape. 



English 

 Thermostat- 

 ic Incubator. 



Fig. 1372 rep- 

 resents a patent 

 English incu- 

 bator on the 

 thermostatic 

 principle. U is , 

 the tank ; R, 

 R, the pipes ; 

 H, the boiler; 



S, the lamp ; B, ventilators ; A, valve ; L, bottom ventilator ; T, wet 

 canvas ; E, wire cage to protect valves, etc. 



Fig. 1373.— Thermostatic Incubator 



