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By Charles Singer et al (eds)

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T h e alloy could also be made directly by melting three parts o f copper, one o f tin, and one-half part o f white arsenic. N eri (p 217), a reliable writer on glass, mentions (1612) a composition like Biringuccio’s which, when melted, is treated with a flux o f tartar, saltpetre, alum, and arsenic [25]. J. H. Cardalucius, in his notes to Ercker (1672), recommends equal parts o f copper and tin to which, when molten, are added one part o f arsenic, one-half part o f antimony, and one-half part o f tartar.

M oreover, the juice o r w ater the Iro n m ust be tem pered in, m u st b e d e e r an d p u re : for i f it be troubled [turbid], the colours com ing fro m heat could n o t b e d isc ern e d : and so th e tim e to plunge the T ools in w ould not be know n, on w hich th e whole A rt d e p e n d s . . and because th at the Iron m ust be m ade m ost hard and tough, therefore the colour m ust be a m iddle colour betw een silver and gold: and w hen th is colour is com e, plunge the whole edge o f the T ool into the liquor, and after a little tim e, take it o u t; an d w hen it appears a V ioletcolour, dip it into the liquor again, lest th e heat, y e t rem aining in th e T ool, m ay again spoil the tem per.

Christdphle Plantin, Antwerp. 1558. ARRIOT, T homas. ’ London. 1588. [12] F orbes, R. J. ’ Brill, Leiden. 1948. [13] PROTHERO, R. , L ord E rnle. * Longmans, London. 1936. G ras, N. S. B. ’ Crofts, New York. 1925. See also communications in Relaz. X Congress. Int. Sci. , Vol. 4, pp. 139-226. 1955. NNE, Charles. ’ Jacques D u-Puys, Paris. 1567. (Published in Latin as Praedium rusticum , Paris. ) S erres, O livier de. ’ Paris. 1600. [15] S torck, j . and T eague, W. D. ’ University o f Minnesota Press, Minneapolis.

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