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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    I 140 The Second Bool]. Chap, as it now weigheth lefsthan thirty Carats and four grainsy XV. fo much containeth a halt Marl] of Gold - Red - Coffer, Section. but to the fine Silver becaufe it looleth upon tfteCopef if it goeth off upon it with Lead as much as the Lead hath carryed away,may by a grain weight be account¬ ed ; for, understand it thus ; In cafe every grain did weigh after it was gone, of 2 9 carats,and 4 grains: alfo a grain waft of fine silver, there would be wafted one Carat upon the half Mar\, then there will come upon the whole <£\dark two carats; thus much C°?fer (or red) containeth a Mark of mixt (fold. & iU If the grains are diligently drawn and weighed, then little Rolls. beat out of every grain a fine and clean piece or Roll, not too thin,and glow it often that it may not be jhive- ry, and that'nothing may go offj at the laft glow the little Roll, and roll it gently over, that you may fee whether by the often glowing and beating fomewhat be come off: When now the Rolls are clean prepared,, glow them once more, and if they from the glow¬ ing and rolling be come hard, let Inch things be men¬ ded. 7\ But the glowing mull be done in a golden little half m’lvml■ pippin made on purpofe,that nothing unclean may come in it, put then the Rolls together in a little fieparating Glafis, put to it near fo much Aqua fortis made for fold- proof's, that it may go an half finger broad over the lit¬ tle Rolls, flop the Separating flafs above with a hard twilled paper, that no vapors may go out, and put it thus into a little Vejfel of Iron or hrafs made on purpofe, over a few live Coals, that the <?Aqua fort, may begin to work, fo will the fieparating-flafs become brown , but let it not work too much or too fall, yet take it a little while from the fire, and then put it on again, un¬ till the Aqua fortis hath done its working, and the Glafis become white again: Then put off the (- Aqua fortis again I