A Dictionary of Chemistry and Mineralogy, with an Account of the Processes Employed in Many of the Most Important Chemical Manufactures Volume 2; To Which Are Added a Description of Chemical Apparatus, and Various Useful Tables of Weights and Measures
A Dictionary of Chemistry and Mineralogy, with an Account of the Processes Employed in Many of the Most Important Chemical Manufactures Volume 2; To Which Are Added a Description of Chemical Apparatus, and Various Useful Tables of Weights and Measures,
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. 1807 Excerpt: ...p-9. each of which is again subdivided by a saliant angle, the apex of which touches the girdle, into one irregular pentagon and two triangles. In the formation of either a brilliant or rose diamond of regular proportions, so much is cut away that the weight of the polished gem is no more than half that of-the rough ...
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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. 1807 Excerpt: ...p-9. each of which is again subdivided by a saliant angle, the apex of which touches the girdle, into one irregular pentagon and two triangles. In the formation of either a brilliant or rose diamond of regular proportions, so much is cut away that the weight of the polished gem is no more than half that of-the rough crystal out of which it was formed, whence the value of a cut diamond is esteemed equal to that of a similar rough diamond of twice the weight, exclusive of the value of the workmanship. The weight, and consequently the value of diamonds, is estimated in carats, 150 of which are equivalent to 240 grains or 1 oz. Troy, and the difference between the cost of one diamond and another, ceteris par 'tbus is as the squares of their respective weights. Thus the value of three diamonds of one, two, and three carats weight respectively, is as one, four, and nine. The average price of rough diamonds, that are worth working, is about 2 pounds sterling for the first carat, and consequently in wrought diamonds, exclusive of the cost of workmanship, the cost of the first carat is = 81. Hence a wrought diamond of 5 carats is worth 200 10 ditto 800 ao ditto 31200 30 ditto 7,200 40 ditto 12,800 50 ditto 20,000 60 ditto 28,800 70 ditto----39,200 80 ditto '51,200 90 ditto 64,800 ico ditto--80,000 This rule however actually holds good only in the smaller diamonds of twenty carats and under, the larger ones, in consequence os the scarcity of purchasers, being disposed of at prices greatly inferior to their estimated worth. The largest diamond at present known is in the possession of the Emperor of Russia, it weighs 779 caTats. The Pitt or Regent Diamond, the finest of the crown jewels of France, weighs 136 carats, and was purchased for 2,500,000 livres. The mineralog...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
All Editions of A Dictionary of Chemistry and Mineralogy, with an Account of the Processes Employed in Many of the Most Important Chemical Manufactures Volume 2; To Which Are Added a Description of Chemical Apparatus, and Various Useful Tables of Weights and Measures,