Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . i of April), beyondwhich time tlu-y cannot reckon upon a sulBcient per-centage to make? it a |iaying business. The illustration A (Fig. 2666) shows the modernEgyptian oven for hatching eggs. a is the entrance room, and b the jiassage betweenthe rows of ovens on each side. The chamber c forthe eggs is below the one d in which the fires aremade in troughs alongsid
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . i of April), beyondwhich time tlu-y cannot reckon upon a sulBcient per-centage to make? it a |iaying business. The illustration A (Fig. 2666) shows the modernEgyptian oven for hatching eggs. a is the entrance room, and b the jiassage betweenthe rows of ovens on each side. The chamber c forthe eggs is below the one d in which the fires aremade in troughs alongside the walls, the heated airpassing to the chamber below by a hole in the floordividing the two apartments, the illustration givesseveral horizontal and vertical sections, the entrancesto the egg-ehaiuliers showing in the upper view at upper chambers are connected. Tlie ancient Egyptian incubators are referred toby Aristotle, Diodorus Siculus, and Flavius Vopiscus. Bonneniains incubator B (A. B. 1777) is heated byhot watin. a is the boiler ; b, a building for holdingthe eggs on shelves ; c, a coop for liohling thechickens ; d, tube for circulating the hot water ; c,a supply funnel ; /, a safety tube. The hot waterFig. 2666. W, Incubators. rises from the boiler into tube d, thence follows thesinuous course of the tube above and below , and into the chicken-coop, eventually dis-charging into the boiler again by the pipe (jr. There is some difference in temperature in the in-terior of the box as the convoluted jiipe parts withits lieat sufficiently to establish a circulation in thepipe. The force of the circulation is in the ratio of thedillerence between the teni|)erature of the water,passing out of the calorifere and re-entering it ; anyunusual degree of coldness in the lower part of thebox will thus react, and inc:rease the speed of thecirculation, the normal tendency of the scheme be-ing towards equalization. The jioint to be regulated is the heat of the fur-nac
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