Works of Francis Bacon Volume 4

Works of Francis Bacon Volume 4

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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. 1862 edition. Excerpt: for the windpipe, and its Greek equivalent rpaxtia, owe their origin to the theory according to which all the arteries are air-vessels. It is worthy of notice that Aristotle uses the word ipii/pia to denote the windpipe exclusively, applying -jih'ip to veins and arteries indiscriminately. He was not however unaware that there is a material diiference in the structure of the two clauses of blood-vessels. 2 Arist. Hist. An. iv. II., and Pliny, xi. 112. That the humming eound emitted by uisny insects is not due to the motion of their wings, appears according to lluruioistcr's experiments to he certain, as it continues after the wings are cut oif, though with n change of note. His theory is that it is caused merely by breathing through the thoracic air-holes as the insect does when on the wing--the hrcsthing going on silently while it is at rest through the ubdominal air-holes. V. Taylor, Scientific Memoirs, i. 877. 177. Trial would be made, whether the inequality or interchange of the medium will not produce an inequality of sound; as if three bells were made one within another, and air betwixt each, and then the outermost bell were chimed with a hammer; how thesound would differ from a simple bell. So likewise, take a plate of brass and a plank of wood, and join them close together, and knock upon one of them, and see if they do not give an unequal sound. So maketwo or three partitions of wood in a hogshead, with holes or knots in them; and mark the difference of their sound from the sound of an hogshead without such partitions. Experiments in consort touching the more treble and the more base tones, or musical sounds. 178. It is evident, that the percussion of the greater quantity of air causeth the baser sound, and the less quantity more

Product details

  • Paperback | 118 pages
  • 189 x 246 x 6mm | 227g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236580370
  • 9781236580375