Encyclopaedia Britannica Or A Dictionary Of Arts Sciences And Miscellaneous Literature

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Encyclop Dia Britannica

Author: Colin Macfarquhar
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The Encyclopaedia Britannica Or A Dictionary Of Arts Sciences And Miscellaneous Literature

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Encyclop Dia Britannica Or A Dictionary Of Arts Sciences And Miscellaneous Literature Enlarged And Improved Vol 1 20

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Encyclopaedia Britannica

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Encyclop Dia Britannica Or A Dictionary Of Arts Sciences And Miscellaneous Literature

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Encyclopaedia Britannica Or A Dictionary Of Arts Sciences And Miscellaneous Literature Vol 6 Of 18

Author: Colin Macfarquhar
Editor: Forgotten Books
ISBN: 9780666944726
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Excerpt from Encyclopaedia Britannica, or a Dictionary of Arts, Sciences, and Miscellaneous Literature, Vol. 6 of 18: Constructed on a Plan, by Which the Different Sciences and Arts Are Digested Into the Form of Distinct Treatises or Systems Diamond pation ofdiamonds, or ocoafioned any degree of fufion. By this heat rubies were foftened, and loll fome of their colour, but preferved their form and weight. By addition of a third lens, ' a further degree of fufion was given to rubies. Even then rubies could not be made to unite with glafs. By having been expofed to this heat, the furface of the rubies which had lingered fu fion, loll: much of their original hardnefs, 'an'd were nearly as foft as cryital. But their internal parts, which had not been fufed, retained their hardnefs. E meralda by this heat were rendered white, or of various colours, and foon afterwards were ful'ed. They were found to have loft part of their weight, and to be ren dered lefs hard and brittle. Experiments were alfo made by order of the empe ror Francis I. On precious ftones from which we find, that diamonds were entirely diilipated by having been expofed 1n crucibles to a violent fire of a furnace du ring 24 hours while rubies by the fame heat were not altered 1n weight, colour, or polilh. By expofing dia monds during two hours only at a time, (the following alterations roduced on them by fire were obferved. Firfi, they lhfl their polifh then they were fplit into thin plates and, lafily, totally diffipated. By the fame wfire, emeralds were fufed. See Magq/z'n dc Ham bourg, tom. Xviii. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Encyclopaedia Britannica Or A

Author: George 1753-1840 Gleig
Editor: Wentworth Press
ISBN: 9781363089239
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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Encyclopaedia Britannica

Author: Colin Ca 1745-1793 Macfarquhar
Editor: Wentworth Press
ISBN: 9781362132059
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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.