Johann Beckmann - A History of Inventions, Discoveries, and Origins, Volume II (of 2)

In the second place, cadmia , among the ancients, was what we call ( ofenbruch ) furnace-calamine, or what in melting ore that contains zinc, or in making brass, falls to the bottom of the furnace, and which consists of more or less calcined zinc. As this furnace-calamine assumes various appearances, according to the manner of melting, and according to many other circumstances that in part cannot be defined, and as the ancients comprehend all its varieties under the general name of cadmia , and give to each variety, according to its form, consistence and colour, a particular name also, a confusion of names has hence arisen which cannot now be cleared up, especially as it is not thought worth while to distinguish all its incidental variations. Our physicians esteem only the pure oxide of zinc; and as they know how to obtain it, they are not under the necessity of using impure furnace-calamine. In our melting-houses it is employed, without much nicety in the choice, for making zinc or brass 87 87 Dioscorides, book v. c. 84, first mentions some sorts of cadmia , βοτρυίτις, πλακωτὴ and ὀστρακῖτις. These, according to Galen and Pliny, are undoubtedly certain kinds of ( ofenbruch ) furnace-calamine; but Salmasius in his book De Homonymis, p. 230, and Sarracen in his Annotations, p. 113, are of opinion that Dioscorides considered them as native kinds of cadmia , or minerals abundant in zinc. I cannot however allow myself to believe that Dioscorides, who was so careful, and who immediately after describes the artificial preparation of cadmia clearly and properly, should have thus erred. Besides, every kind of ofenbruch (furnace-calamine) must have discovered its origin from fire to such a good judge of minerals as Dioscorides. I am convinced that he, as well as Galen and Pliny, considered the above kinds as furnace-calamine. Pompholyx was the name of the white flowers of zinc which Dioscorides, v. 85, p. 352, compares to wool, and which by chemists were formerly called lana philosophica . The ancients collected these flowers when produced by the melting of zinc-ore; but they obtained them also by an apparatus which is fully described by Dioscorides and Galen, and which approaches near to that used for collecting arsenic in the poison melting-houses, as they are usually called. .

What here appears to me most singular is, that the ancients should have given the same names to furnace-calamine as they gave to ores that contained zinc. The affinity of these substances they could conjecture only from their effects, or perhaps they were induced to do so from observing that furnace-calamine was not produced but when the different kinds of cadmia , as they were called, were melted; that is, when yellow and not red copper was obtained. Ofenbruch got the name of furnace-calamine at Rammelsberg, when it was observed that it could be employed instead of native calamine for making brass 88 88 This however I will not with certainty affirm. As calmey and galmey have probably taken their rise from cadmia or calimia , and as both these words signified proper calamine, as well as ofenbruch , the latter, perhaps, may at an earlier period have signified furnace-calamine. . Were the ancients then in any measure acquainted with this use of it? Galen and Dioscorides speak only of its use in medicine, and say nothing of its being employed in the preparation of brass. The Arabian writers, particularly the translators of the Greek physicians, speak in a much clearer manner of the preparation of brass; but the appellations which they employ are so indeterminate in their signification, that an answer to the above question cannot be deduced from them. Climia , which some pronounce calimia and from which the modern Greeks made kelimia , and the Latins lapis calaminaris , seems to have entirely the same meaning as cadmia . Tutia , which occurs first in the eleventh century, in Avicenna, and which the Greeks write toutia , or perhaps more properly thouthia , signifies sometimes pompholyx ; but in common it seems to express also minerals that contain zinc, and likewise furnace-calamine 89 89 Proofs respecting this subject may be found in Salmasius De Homonymis. . Could it be proved that the tutia of the Arabs and later Greeks was furnace-calamine, or the tutia of our druggists, the oldest account with which I am acquainted of furnace-calamine, employed in making brass, would occur in Zosimus, who, according to every appearance, lived in the fifth century 90 90 It is not certainly known when this Zosimus Panopolitanus lived. His works, which must contain abundance of information respecting the history of chemistry, have never yet been printed. The greater part of them were preserved in the king’s library at Paris. The receipt to which I allude has been inserted by Salmasius, p. 237. . This author tells us, that in order to make brass, Cyprus copper must be melted, and pounded tutia must be strewed over it. Salmasius suspects that Zosimus here means only calamine: but however this may be, his receipt has been retained till the present time in books on the arts; for these recommend not calamine, but tutia 91 91 We read in Observations sur la Physique, vi. p. 255, that for many years tutia has been collected and sold in the bishopric of Liege. Lehmann endeavours to show that it was made by the Jews in Poland. Novi Comment. Acad. Petrop. xii. p. 381. As the use of tutia [which is an impure oxide of zinc found in the chimneys of the furnaces in which zinc-ores are roasted, or in which zinciferous lead-ores are smelted] has been almost abandoned, because physicians prefer pure flowers of zinc, and because those who make pinchbeck employ purified zinc, it is probable that this substance will soon be entirely neglected. .

We can with more certainty affirm that this use of furnace-calamine, in making brass, was known to Albertus Magnus in the thirteenth century; for he says, first, that yellow copper was made by the addition of calamine, which he calls lapis calaminaris . He tells us afterwards, that Hermes taught how to give a gold colour to copper by throwing pounded tutia into the melted metal. Tutia , says he, which is used in the transmutation of metals, is not a native mineral, but an artificial mixture, produced in the furnace when copper-ore is melted; and he advises glass-gall to be strewed over the ore, otherwise calamine and tutia will lose their force in the fire 92 92 De Mineralibus. Coloniæ, 1569, 12mo, p. 350, lib. iv. cap. 5; and lib. v. cap. 7, p. 388. . It would appear that the last-mentioned name, in the thirteenth century, signified only furnace-calamine, and that its use for making brass was at that period known.

For many centuries, however, the ofenbruch (furnace-calamine), with which, as we are told, the furnaces at Rammelsberg overflowed, was thrown aside as useless, till at length, in the middle of the sixteenth century, Erasmus Ebener first showed that it might be used instead of native calamine for making brass. This Ebener, descended from the noble family of that name at Nuremberg, was a man of great learning, and an able statesman. He was employed by his native city, and by foreign princes, on occasions of the highest importance. In 1569 he was privy-counsellor to Julius duke of Brunswick, and died in 1577, at Helmstadt, where he was buried. I regret much that I can give no further account of this important discovery; the time even when it was made is not known with certainty. Lœhneyss says that it was sixty years before the period when he wrote. But at what period did he write? The oldest edition, with which I am acquainted, of his treatise on mines, is of the year 1617, so that this discovery would fall about the year 1557 93 93 The other edition was printed at Stockholm and Hamburg, by Liebezeit, and is the same as that mentioned by H. Gatterer, in Anleitung den Harz zu bereisen, i. p. 313, and ii. p. 13. . Calvör caused to be printed an old account of the Rammelsberg mines, which was said to have been published in 1565. According to that work, Ebener made the above-mentioned observation at Nuremberg, about seventeen years before, that is, about the year 1548. Schluter assigns as the period about 1550, and Honemann about 1559. We may therefore very safely place it in the middle of the sixteenth century, and probably the discovery happened in 1553, at which time Ebener was sent to duke Henry, with whom he continued a long time, as we are expressly told by Doppelmayer. This use of calamine refuse induced the managers of the profitable brass-works in the Harz forest to pick up carefully that which before had been thrown aside. Duke Julius, who endeavoured to improve every branch of manufacture, and particularly what related to metallurgy, and who, agreeably to the then prevailing mode of princes, suffered himself to be duped with the hopes of making gold, improved the brass-works at Buntheim, below Harzburg, and by these means brought a great revenue to the electoral treasury.