1016 



POULTRY., 



invention of Rouillier's Hydro-incubator. The principle of all hot- 

 water machines is that a large body of unexposed hot water, con- 

 fined by a non-conducting medium, will retain its heat for a long' 

 time. In all of them the sides and top are lined with some such ma- 

 terial as felt, sawdust, etc., and the 

 hot-water tank is above the egg- 

 chamber. Lamps are now used with 

 the majority of hot-water incuba- 



Fig. 1368. — Regulator of the Boyle Incubator. 



Fig. 1369.— Plan of Boyle Incubator. 



tors, and when the regulator is efficient, which is the case in many 

 machines, the success is admirable. 



The Tomlinson Incubator. 



We give in Figs. 1370 and 1371 plans of the Tomlinson incu- 

 bator shown in sections.. This machine is constructed on the early 



principle of a lamp kept con- 

 stantly burning in conjunc- 

 tion with an automatic reg- 

 ulator. 



A (in both cuts) is the 

 case, and the shaded space 

 is the packing ; C (in both 

 cuts), the tank, traversed by 

 flues ; E, door for cleaning 

 same ; F, front of egg- 

 drawer ; G, egg-drawer ; 

 H, H (in both cuts), bottom 

 ventilators admitting air to 

 the egg-drawer ; D, lamp ; 

 h, h, chambers communicat- 



Fig. 



1370. — Tomlinson's Automatic Incubator. 

 First Section. 



