Proceedings of the American Academy of Arts and Sciences Volume 6

Proceedings of the American Academy of Arts and Sciences 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. 1866 edition. Excerpt: ...oxygen were to be admitted for 1 bubble of carbonic acid appearing in the potash bulbs. The case would then be further simplified by having the openings in the sulphuric acid bulbs of such size as would give bubbles twice as large as those from the potash bulbs; as then, when the bubbling should be equally rapid in both, the relation between the volumes of the gases would still be maintained, viz. 2 vols, of oxygen to 1 vol. of carbonic acid. Such bulbs would be highly desirable, but would probably have to be made expressly for the purpose. 4. As an additional control over the supply of oxygen, and serving also as a temporary safeguard against the escape of incompletely oxidized substance, in case of too rapid distillation, with an insufficient flow of oxygen, I have two or three inches in length of the tube filled with coarse, strongly ignited oxide of copper, placed in front of the asbestos, and this followed by a plug of the latter substance to keep it in place, and prevent the formation of a channel along the upper surface of the oxide of copper. The tube itself being laid in an iron trough, as above described, with the upper half of the tube exposed, the oxide of copper is heated in such a manner that any reduction would be readily observed at the end in contact with the asbestos. In this manner it serves as a valuable indicator, by which to determine, at a glance, whether the flow of oxygen is sufficient. It will rarely happen that any reduction of the oxide of copper will take place. I have, however, in some of my earlier experiment', with too short a column of asbestos, and ill-adapted bulbs, had so much of the oxide of copper reduced that combustible gasses passed through the absorbing apparatus; and in one instance, when the more

Product details

  • Paperback | 196 pages
  • 189 x 246 x 11mm | 358g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236553616
  • 9781236553614