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Heat-reg′u-lator.

A device invented by Bonnemain, to keep up an equable heat in his incubator (which see). An iron rod a is tapped at its lower end into a brass nut c, inclosed in a leaden box d, terminated above by a brass collet e. The greater expansibility of the lead causes it, when the heat rises to the desired point, to elevate the collet e, which presses against the shorter arm of the bent lever f g, to the longer arm of which is connected a rod h, and serves to open or close a register that admits air to the fire. The instrument is provided with a dial graduated to indicate if there is an excess or deficiency of heat. See thermostat.

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