Appletons' Annual Cyclopedia and Register of Important Events; Embracing Political, Military, and Ecclesiastical Affairs Public Documents Biography, S

Appletons' Annual Cyclopedia and Register of Important Events; Embracing Political, Military, and Ecclesiastical Affairs Public Documents Biography, S

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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. 1870 edition. Excerpt: ... great size and good quality, 16 feet and 20 feet in length. The Rhiwbryfdir Slate Company showed that a block (18 inches by 10 inches) which is an inch and a half thick, may be split and dressed into 39 slates; and that out of a block (20 inches by 10 inches) half an inch thick, 8 slates can be sawn, the waste in such case being hardly perceptible. A model of a slate-dressing machine, consisting of knifeedges placed obliquely on a revolving drum, so as to work like the down-cut of a carpenter's saw, was exhibited by one of the PortMadoc contributors, Mr. J. W. Greaves; and the company there, above named, seem to have a machine that will dress 12,000 to 15,000 slates per diem, accurately and completely. M. Alibert exhibited in the Russian portion of the nave blocks of graphite or plumbago, from an extensive bed recently discovered in Siberia. It takes so high a polish as to be mistaken for steel. In travelling through Eastern Siberia M. Alibert found some traces of this mineral in a remarkably pure state, and knowing its value and importance, he set himself to work to search for the vein, which he felt satisfiod must be in the neighborhood. For fifteen years, at considerable expense, he persevered, and was at last rewarded by arriving at a bed of graphite. The French geological maps of France were numerous and important. Among the more remarkable was an atlas of twelve sheets, forming a map of the ancient principality of Dombes in the department of the Ain, a curious district of about 100,000 hectares, of which area more than one sixth has been converted into fishponds, which are in number about 1,600, and are emptied every two years to obtain the fish, and to be planted for cereals, and afterward again filled with water and stocked with young...show more

Product details

  • 12-17
  • Paperback | 806 pages
  • 189 x 246 x 41mm | 1,411g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123663912X
  • 9781236639127