xvi ILLUSTRATIONS 



Fig, 

 150. 



Page 



-„-. Diagram hot-air incubator ^^ 



151. Egg tray and thermometer ^"t, 



152. Double-deck coal-burning incubator ""7 



153. Interior incubator cellar ^ 



154- Erection of mammoth incubator ^TI 



155. Completion of mammoth incubator "J^ 



156. Well-built incubator heater J^Z 



157' Diagram incubator heater and lamp ■+ 



158. Gas heater for incubator j^ 



159- Design for concrete incubator cellar 5 



160. Oil-burning lamp approved by fire underwriters 252 



161. Mammoth incubator with trays arranged in tiers 253 



162. Doing the work of four hens with an incubator 257 



163. Sectional view coal-burning incubator 258 



164. Plans for hatching egg cabinet 260 



165. End view of egg cabinet 201 



166. Turning and cooling eggs for hatching 264 



167. Plans for electric egg tester 265 



168. Appearance of hatching eggs through tester 266 



169. Testing hatching eggs 267 



170. Simple egg-testing outfit 268 



171. Diagram showing growth of air cell 269 



172. Double-deck mammoth incubators in large hatchery 271 



173. Interior of a California hatchery 273 



174. Incubator room in a large hatchery 274 



175. 10,000 chicks ready for shipment 275 



176. Well-designed incubator building 276 



177. Hatchery of 600,000 egg capacity 278 



178. Express shipment of chicks 279 



179. Double-deck mammoth incubators 281 



180. A farm brood 284 



181. Simple devices for sitting hens 285 



182. Broods on a grassy range 286 



183. Section through outdoor incubator 287 



184. Plan of coop for sitting hens 288 



185. Front elevation of coop for sitting hens 289 



186. Rear perspective of coop 290 



187. Dusting sitting hens 292 



188. Makeshift coop 293 



189. Rectangular brood coop 294 



190. V-shaped brood coop and run 294 



191. Hot-water brooding system 296 



192. Brooder house with outdoor runs 297 



193. Brooder stoves are great labor savers 299 



194. Colony brooders on Government station 300 



195. Homemade fireless brooder 301 



196. 50-chick size lamp brooding hover 302 



197. Outdoor colony brooder 303 



198. Brooder — complete outfit 304 



199. Sectional view coal-burning brooder stove 305 



200. Chicks sleeping around stove : 306 



201. Combination brooder and colony house ^o- 



202. Filling coal hopper of a brooder stove \oS 



