A course of chymistry. Containing the easiest manner of performing those operations that are in physick. With curious remarks and useful discourses upon each operation / writ in French by Nicholas Lemery ; Translated by Walter Harris.

  • Nicolas Lemery
Date:
1677
Catalogue details

Licence: Public Domain Mark

Credit: A course of chymistry. Containing the easiest manner of performing those operations that are in physick. With curious remarks and useful discourses upon each operation / writ in French by Nicholas Lemery ; Translated by Walter Harris. Source: Wellcome Collection.

    73/390 (page 31)
    A Couurle of Chynrittry. 33 Purification: of Silver: : Silver is Purified by the Coppel after the fol- lowing manner : take'a Coppel made of the Afhes of Bories or Horns, cover it and heat it gently over the coals, until it grows red-hot, then calt into it four or five times as much Lead as you intend to purifie Silver: let the Lead melt, and fill the fides of the Coppel, which is foon done then caft your Silver into the middle, and it will prefently melt, Lay wood round about the Cop- pel, and blow itthat the flame may reverberate onthe matter, the impurities willmix with the Lead, and the Silver remain pure and clean in the middle of the Coppel, while the Lead being fill'd with the droflie parts of Silver lies onthe fides like a fcumny, that you may gather up with which according tothe degree of Calcination it hath endured, becomes of divers Colours, and fometimes is called_Litharge of Gold, ard fome- times Litharge of Silver. If you leave it in the Coppel, it will pafs through its Pores, ‘For you muft obférve rhat the Coppel being exprefly made of Afhes deprived‘of Salc, is very Porous; you muft continue the Fire till there rifeno more vapours. ~ *> © °° à This Preparation cleanfes Silver from all other ofthe Coppel. You muft therefore have recourfe to the Operation I defcribed, when] fpoke of the | Purifica: