 ... use of iron filings is mentioned by Mitchell and by Percy, both of whom refer to still earlier work. In fact, this seems to have been one of the earliest forms in which iron was used for assay purposes. In Cramer's work on assaying (Mortimer's translation,...  Elements of the Art of Assaying Metals - Seite 242von Johann Andreas Cramer - 1764 - 471 SeitenVollansicht - Über dieses Buch
 | Johann Andreas Cramer - 1741 - 522 Seiten
...Multitude of fmall Bubbles, very difficult to be confined, unlefs the Phlogifton be intirely confumed, and the Litharge reduced to Lead, which fometimes rifes...and Lead, of Silver out of a Mixture containing a gnat Deal of Sulphur. APPARATUS. THIS may be done in the fame Manner as in'th« foregoing Procefs,... | |
 | 1913 - 1038 Seiten
...purposes. In Cramer's work on assaying (Mortimer's translation, 2d ed., 1764) one section is devoted to " Precipitation by Iron and Lead of Silver out of a Mixture containing a great Deal of Sulphur," in which the reader is cautioned " You must not use Filings quite spoiled with Rust : For they have... | |
 | 1913 - 1450 Seiten
...purposes. In Cramer's work on assaying (Mortimer's translation, 2d ed., 1764) one section is devoted to " Precipitation by Iron and Lead of Silver out of a Mixture containing a great Deal of Sulphur," in which the reader is cautioned " You must not use Filings quite spoiled with Rust : For they have... | |
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