Bulletin Volume 1-18; Nos. 20-39; Nos. 41-58

Bulletin Volume 1-18; Nos. 20-39; Nos. 41-58

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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. 1888 edition. Excerpt: ... afterwards filling the tent with hydrocyanic acid gas, generated from fused potassium cyanide, sulphuric acid, and water. This gas is much lighter than air and as soon as generated rapidly rises ami fills the tent It is of course fatal to all forms of animal life, and care must be exercised in using this treatment. The tent is usually constructed in the form of an octagonal sheet, of what is ordinarily known as 8-ounce duck, and is. afterwards oiled with boiled linseed oil. A tent of this kind, measuring 40 feet in diameter, will cost about $50, and other sizes in like proportion. Almost any glazed earthenware vessel will answer the purpose of a generator. The potassium cyanide used is usually of -0 per cent, strength and the sulphuric acid is of the ordinary commercial brand. The proportions are, 1 ounce by weight of cyanide 1 fluid ounce of the acid, and 3 fluid ounces of water. This is sufficient for 150 cubic feet of space inclosed by the tent. The water is first placed in the generator, the acid added, and after the generator is placed under the tent the cyanide is added to the solution. The cost of the chemicals mentioned is small. The tree is subjected to the action of the gas for about half an hour. In treating trees 10 feet high or less, the tent can be placed over the tree by hand, but for those of greater height than this some sort of apparatus must be used for the purpose of elevating the tent over the tree. An apparatus in the form of a tripod, with a pulley at the top, serves this purpose very well. The following table of the relative amount of ingredients to height and girth of tree top will be found useful: The best results will be obtained by treating the trees during the colder portion of the year or at night, as'the gas...show more

Product details

  • Paperback | 392 pages
  • 189 x 246 x 21mm | 699g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236527011
  • 9781236527011