Railway Locomotives and Cars Volume 6

Railway Locomotives and Cars Volume 6

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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. 1838 edition. Excerpt: ... them a distinguished rank among the gems. Notwithstanding this, they are but ill suited to the purposes of jewelry, on account of their softness, their gieat frangibility, and theii sometimes splitting on a change of temperiture. By the Turks they are so peculiarly estesmed, that a fine opal of moderate size has been sometimes sold at the price ol a diamond. The esteem in which they were held among the ancients Romans was such, tiiat Nonius, the Roman senator, is stated to have preferred banishment to parting with a favorite opal wnich Mark Anthony was anxious to possess. In the abbey of St. Denys, near Paris, there was formerly a curious ancient opal, which was green on the outside, and w.ien viewed against the light, exhibited a fine ruby color. Li the purchasing of opals, great caution is requisite, since fine glass pastes have no: unfrequently been substituted for thorn, and so d at enormous prices. Hydrophone, or oculus mundi, is a kind ol opal, the distinguishing characteristics of wnich is, that it gradually becomes transparent by immersion in water. It is either of a whitish brown, yel owish, green, milkygrey, or yellow color, and opaque. The name of oculus mundi has been given to ttiese stones from an internal spark, or lu minous spot, which changes its position according to the direction in which they arc field to the light. T.io countries in which they arc chiefly found are Hungary and lcelai.d. The phenomena of their becoming trans parent in water, is supposed to be occasioned by that fluid soaking through their whole substance, in t.ie same ma-iner as t.ie transparency of paper is occasioned by the immersing it in o l. Wnen taken out of the water, these stones, as th-y dry, beconv: again opaque Bingley's Useful Know ledg-. New...show more

Product details

  • Paperback | 858 pages
  • 189 x 246 x 43mm | 1,501g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236601394
  • 9781236601391