Fleta minor. The laws of art and nature in knowing, judging, assaying, fining, refining and inlarging the bodies of confin'd metals. In two parts. The first contains essays of Lazarus Erckern ... in V books: originally written by him in the Teutonick language, and now translated into English. The second contains essays on metallick words, as a dictionary to many pleasing discourses by Sir John Pettus ... Illustrated with 44 sculptures ... / [Sir John Pettus].

  • John Pettus
Date:
1683
Catalogue details

Licence: Public Domain Mark

Credit: Fleta minor. The laws of art and nature in knowing, judging, assaying, fining, refining and inlarging the bodies of confin'd metals. In two parts. The first contains essays of Lazarus Erckern ... in V books: originally written by him in the Teutonick language, and now translated into English. The second contains essays on metallick words, as a dictionary to many pleasing discourses by Sir John Pettus ... Illustrated with 44 sculptures ... / [Sir John Pettus]. Source: Wellcome Collection.

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    . * \ ,'X Chap, of it at lead; a Centner, or elle when the work is caft xxv. forth, as much as it doth weigh is to be cut and aflayed together : And keep this Order, that always of the whole that is cafi, a Ipecial proof may be made, and to take it out of 2 or 5 proofs; or elfe the true Con¬ tent will not be found, except it be that of each caff piece the whole quantity be weighed in, and to go off upon a great Coppel altogether * but if you wTould have for a Proof Tome cut out of the Cahgs, you may cut out of each (efpecially if the Work be rich) according to the bignefs above and below, to weigh fome of all,and to prove it. sea.on. There are alio fome works which are very mijfy Vulcan and and very unclean ( like Kobolt and courfe Wijmet and other flei^y Oars) which are melted; and fome among the reft are fo very unclean that when the Cafyf do lye a few daies,they do fall afunder: fuch flub- born and unclean Oars,in general, cannot be aflayed like unto the good; but when fitch Work hath been weigh¬ ed, then cut or beat out of every Cafy a piece,aiid weigh it fb unclean as it is, vis^.of every cut, and aflay as fol¬ lowed! : Take of the work as much as it is in weight, put it on the Teft in the Ajjay-oven, caufe it to flack, that the Fury and wildnefs may be contained, let it cool and knock it off, and caufe it to go clear off from the Cop-pel, but if it be not flacked at firft, but fet raw upon the , then it will work upon the C°]>feh and will not go clean off, as is ftiewn. Some A flayers do ufe to take the Content of tach un- f p clean Work, and caufe it to go together in a great Afaj~ Cuftom Tell or Iron-Kiln, and cafi: it forth, and then weigh of it for a Tryal, which is not right (although they do think they fiiall obtain the trueContentsjbecaufe by this running together the Contents comes finer,and the proof is made richer,therefore the abovefaid way is much better, by which the tru^Contents is found. But