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Updated: May 8, 2025
He now began to subject the Mercury to all sorts of chemical processes, to sublime it, and to calcine it with all manner of things, with salts, sulphur, metals, minerals, blood, hair, aqua fortis, herbs, urine, and vinegar.... Everything he could think of was tried; but without producing the desired effect."
It seems clear to us that the one method of proving the accuracy of Mayow's supposition must be, to weigh a definite, combustible, substance say, a metal; to calcine this in a measured quantity of air; to weigh the product, and to measure the quantity of air which remains; to separate the product of calcination into the original metal, and a kind of air or gas; to prove that the metal thus obtained is the same, and has the same weight, as the metal which was calcined; and to prove that the air or gas obtained from the calcined metal is the same, both in quality and quantity, as the air which disappeared in the process of calcination.
It greatly improves all kinds of japan work to harden the varnish by means of heat, which, in every degree that can be applied short of what would burn or calcine the matter, tends to give it a firm and strong texture where metals form the body; therefore a very hot stove may be used, and the stoving may be continued for a considerable time, especially if the heat be gradually increased.
But put the case, we were now living in the age of Sylla, Marius, Caesar, and other such Roman emperors, or that we were in the time of our ancient Druids, whose custom was to burn and calcine the dead bodies of their parents and lords, and that you had a mind to drink the ashes or cinders of your wives or fathers in the infused liquor of some good white-wine, as Artemisia drunk the dust and ashes of her husband Mausolus; or otherwise, that you did determine to have them reserved in some fine urn or reliquary pot; how would you save the ashes apart, and separate them from those other cinders and ashes into which the fuel of the funeral and bustuary fire hath been converted?
I saw another at work to calcine ice into gunpowder; who likewise showed me a treatise he had written concerning the malleability of fire, which he intended to publish.
Lavoisier concluded that to calcine tin is to cause it to combine with a portion of the air wherein it is calcined. The weighings he made showed that about one-fifth of the whole weight of air in the closed flask wherein he calcined tin had disappeared during the operation.
She reminded herself, beside, that "Missis wasn't often that inconsiderate, and most probably there was reasons this time," which made it easier to overlook her offence. So she kept some things back, and took some things off, and managed to send in the food in an eatable condition, instead of letting it calcine into cinders as a less conscientious and capable cook would have done.
Any ordinary cylinder of a length of 25 ft., and a diameter of 4 ft. 6 in., inclined 1 ft. 6 in. in its length, will calcine from 24 to 48 tons per diem. Another form of rotating furnace is one in which the axis is horizontal. It is much shorter than the inclined type, and the feeding and removal of the ore is effected by the opening of a retort lid door provided at the side of the furnace.
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