A history of inventions and discoveries Volume 1

 
9781459021167: A history of inventions and discoveries Volume 1

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1817 Excerpt: ... " estimation in which music is held in England; " the liberality of the English nobility, and their " readiness to spare no expenses in bringing for" ward any useful invention, a property peculiar " to the English; it affords just matter of surprise, "that the English artists should have suffered " themselves to be anticipated by a German "journeyman lace-maker. To our Hohlfeld, " therefore, will incontestably remain the lasting " honour of having executed a German invention; " and the Germans may contentedly wait to see " whether Burney will find an English mechanic " capable of constructing this machine, from the " information given by his countryman Creed." REFINING GOLD AND SILVER ORE BY QUICKSILVER. AMALGAMATION. It is well known that quicksilver unites very readily with almost all metals, and when added in a considerable quantity forms with them a paste which can be kneaded, and which is called amalgam. On the other hand, as it does not suffer itself to unite with earth, being a metallic substance, it furnishes an excellent medium for separating gold and silver from the earth and stones in which they are found. The amalgam is squeezed through a piece of leather, in which these precious metals remain with a certain portion of the quicksilver; and the former are freed from the latter by means of fire, which causes the semi-metal to evaporate. This amalgam made with gold serves also for gilding metals, if it be rubbed over them, and afterwards heated till the quicksilver be dispersed by evaporation. The first use of quicksilver is commonly reckoned a Spanish invention, discovered about the middle of the sixteenth century; but it appears from Pliny, that the ancients were acquainted with amalgam, and its use, not only for separating gold and silver from ...

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