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Updated: June 10, 2025
This now has been worked out to a point where, with any good incubator and an experienced operator, the temperature of the egg chamber is readily kept within the desired range. These are two principal types of box incubators now in use. In the earliest of these, the eggs were heated by radiation from a tank of hot water.
"The manipulation of the tins is quite easy." He conducted us to a small room on the top floor, which I at once saw was fitted as a laboratory, and which contained microscopes, incubators, stands of test-tubes, and all the other apparatus appertaining to the bacteriologist. One of his assistants had carried up four small tins of beef, with a couple of bottles of beef extract.
"'True, then, I'm afraid of guns, says Norah. 'They make such noise in my ears. But Uncle Tim, he shot them, he did, and won cigars. 'Tis a fine time we had this day, Mr. Carnahan. "'I'm glad you've enjoyed yerself, I says. 'I suppose you've had a roarin' fine time seein' the sights. And how did the incubators and the helter-skelter and the midgets suit the taste of ye?
Upon the subject of the loss of water for the whole period of incubation, valuable data has been collected at the Utah, Oregon and Ontario Experiment Stations. In these tests we find that as a rule the evaporation of eggs under hens is less than in incubators. With both hens and incubators, the rate of evaporation is greatest at the Utah Station, which one would naturally expect from the climate.
A few years ago some one with an investigating mind decided to see if incubators were properly ventilated, and proceeded to make carbon dioxide determinations of the air under a hen and in an incubator. The air under the hen was found to contain the most of the obnoxious gas. Now, this information was disconcerting, for the hen had always been considered the source of all incubator wisdom.
In a row stood five large, glass-mounted incubators; behind the glass doors lay, in dormant majesty, five enormous eggs. The eggs were pale-green lighter, somewhat, than robins' eggs, but not as pale as herons' eggs. Each egg appeared to be larger than a large hogs-head, and was partly embedded in bales of cotton-wool.
But equal rights do not necessarily imply identical duties; there is a certain division of labor laid down by nature. Women alone can bear children, mothers alone can properly rear them; no incubators and institutions can supply this fundamental need.
Infertile eggs cannot heat because the germ has not been fertilized and can make no growth. That such infertile eggs cannot spoil is, however, a mistaken notion, for they are subjected to all the other factors by which eggs may be spoiled. The sale of eggs tested out of the incubators has been encouraged by the dissemination of the knowledge that infertile eggs are not changed by incubation.
We have hatched pheasants and quail in incubators and then turned them over to electric brooders. We have all kinds of bird houses and nests. The sparrows, who are great abusers of hospitality, insist that their nests be immovable that they do not sway in the wind; the wrens like swaying nests. So we mounted a number of wren boxes on strips of spring steel so that they would sway in the wind.
The poultryman has been a disciple of the poultry papers and poultry fanciers of the day. The poultry papers and poultry literature has generally been supported by poultry fanciers and manufacturers of incubators, patent nests and portable houses. The good folks have vied with one another in complicating the business.
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