. Practical artificial incubation. A resumé of the progress made in the past few years in artificial incubation in this country and Europe . at and constant, perfectventilation, with sufficient moisture, a very muchlarger percentage of eggs will hatch and the chickswill leave the shell stronger and livelier than with un-even and fitful temperature and imperfect ventilation. Again, the thermostat or pyrometer, by constantuse for a few weeks, becomes, to a great degree, sensi-ble to the change of the temperature, so that at leastone of the manufacturers sends two pyrometers witheach machine, wit
. Practical artificial incubation. A resumé of the progress made in the past few years in artificial incubation in this country and Europe . at and constant, perfectventilation, with sufficient moisture, a very muchlarger percentage of eggs will hatch and the chickswill leave the shell stronger and livelier than with un-even and fitful temperature and imperfect ventilation. Again, the thermostat or pyrometer, by constantuse for a few weeks, becomes, to a great degree, sensi-ble to the change of the temperature, so that at leastone of the manufacturers sends two pyrometers witheach machine, with private instructions to change thesame every twenty-four hours, in order to alleviatethis difficulty. This of course will be allowed to be an extra amountof labor; and, as they generally have to be slightlyaltered each time, are a considerable care. In conclusion, the machine in which the egg-draweris most evenly heated, perfectly ventilated, and mosteasily managed, is worthy the attention of all desiringan Incubator — and such an one I believe the Reli-ance to be. The Centennial Incubator. 35 CHAPTER IV. The Centennial Patented March, 1880. This thoroughly practical machine lias been beforethe public for a number of years; having received its 36 Artificial Incubation. name from the fact of its first being exhibited at theCentennial Exhibition, at Philadelphia, Pa., in 1876. Since that time, however, it has been very muchaltered and improved, being now constructed entirelyof galvanized iron and copper. All the heating partsare of copper, encased and protected by galvanizedsheet iron ; the spaces between filled in with non-con-ducting material. The body of the Incubator isdouble — one case inside of the other — and theintervening space is also filled in with a insures no waste of heat, and comparative pro-tection from sudden changes in the outside tempera-ture. Lately, this non-conducting jacket has been doubledin thickness, and improved m
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