Theophili, qui et Rugerus, presbyteri et monachi, libri III. de diversis artibus: seu, Diversarum artium schedula

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J. Murray, 1847 - 447 pàgines
 

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Pàgina 115 - Let him that stole steal no more: but rather let him labour, working with his hands the thing which is good, that he may have to give to him that needeth.
Pàgina 317 - When you have scraped the gold from silver, place this scraping in a small cup in which gold or silver is accustomed to be melted, and press a small linen cloth upon it, that nothing may by chance be abstracted from it by the wind of the bellows, and placing it before the furnace, melt it; and directly lay fragments of sulphur in it, according to the quantity of the scraping, and carefully stir it with a thin piece of charcoal until its fumes cease; and immediately pour it into an iron mould. Then...
Pàgina 49 - To make ink, cut for yourself wood of the thorn-trees in April or May, before they produce flowers or leaves, and collecting them in small bundles, allow them to lie in the shade for two, three, or four weeks, until they are somewhat dry. Then have wooden mallets, with which you beat these thorns upon another piece of hard wood, until you peel off the bark everywhere, put which immediately into a barrelful of water.
Pàgina 34 - Si autem volueris opus tuum festinare, sume gummi, quod exit de arbore ceraso sive pruno, et concidens illud minutatim, pone in vas fictile, et aquam abundanter infunde, et pone ad solem, sive super carbones in hieme, donec gummi liquefiat, et ligno rotundo diligenter commisce.
Pàgina 403 - ... estimation) much delighted, upon gold, let him learn the discovery which I made with profound thought, for it is very precious. I procured urine, with the fresh blood of a huge hegoat, fed for a short time upon ivy, which being done, I cut the gems in the warm blood, as directed by Pliny, the author who wrote upon the arts which the Roman people put to proof, and who also well described the virtues of stones; of which he 1 Sec Theoph., E.
Pàgina 319 - ... lay fragments of sulphur in it, according to the quantity of the scraping, and carefully stir it with a thin piece of charcoal until its fumes cease; and immediately pour it into an iron mould. Then gently beat it upon the anvil, lest by chance some of that black may fly from it which the sulphur has burnt, because it is itself silver. For the sulphur consumes nothing of the gold, but the silver only, which it thus separates from the gold, and which you will carefully keep. Again melt this gold...
Pàgina 75 - I looked in vain amongst the MSS. and on the animal charcoal surrounding them, for vestiges of letters in oxide of iron ; and it would seem from these circumstances, as well as from the omission of any mention of such a substance by Pliny, that the Romans, up to his period...
Pàgina 152 - Post hœc toile caput unius imaginis, et circumvolvens illud plumbo repone diligenter in suo loco, et cirçumfige ei très clavos cum malleo ad hoc opus apto, adjungens ei pectus et brachia ac reliqua vestimenta ; et quamcumque partem stabilieris, confirma earn exterius clavis, ne moveatur a suo loco. Tune habeas ferrum solidatorium, quod sit longum et gracile, in summitate vero grossum ac rotundum, et in summo ipsius rotunditatis deductum et gracile, limatum et superstannatum, ponaturque in ignem....

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