Ficheru:De Re Metallica 1556 p 357AQ20 (3).TIF

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Autor
Agricola, Georg, 1494-1555
Descripción
English: Page 357 from De re metallica libri XII. quibus officia, instrumenta, machinae, ac omnia deni ad metallicam spectantia, non modo luculentissimè describuntur, sed et per effigies, suis locis insertas, adiunctis latinis, germanicis appellationibus ita ob oculos ponuntur, ut clarius tradi non possint. Eiusdem De animantibus subterraneis liber, ab autore recognitus: cum indicibus diversis, quicqiuid in opere tractatum est, pulchré demonstrantibus by Georgii Agricolae. Basileae : [Apud Hieron Frobenium et Nicolaum Episcopium], 1556.

Production of nitric acid

The first step in separating gold from silver is the production of nitric acid from saltpeter and vitriol, shown here. The ingredients are heated in distilling apparatus (labeled H in the illustration), which then give off a red vapor (NO2) that combines with water and oxygen in the air to form nitric acid (HNO3). The acid is collected in flasks (labeled K).
Data 1556
date QS:P571,+1556-00-00T00:00:00Z/9
institution QS:P195,Q5090408
Númberu d'inventariu
TN617 .A475 1556, Library collections, Science History Institute.
Notes Image downloaded with permission from the Science History Institute, as part of the Wikipedian in Residence initiative.
Fonte/Fotógrafu Science History Institute
Permisu
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Public domain

The author died in 1555, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1930.

This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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