 ... 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 - Page 242by Johann Andreas Cramer - 1764 - 471 pagesFull view - About this book
 | Johann Andreas Cramer - Assaying - 1741 - 522 pages
...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,... | |
 | Mineral industries - 1913 - 1038 pages
...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... | |
 | Mineral industries - 1913 - 1450 pages
...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... | |
| |
