Handbook of General Therapeutics Volume 7

Handbook of General Therapeutics Volume 7

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 edition. Excerpt: ...off two small twigs directed vertically upwards, coursed towards the frontal region. At the angle made by the facial and temporal surfaces of the frontal bone, it projected about two millimetres above the surface, and three millimetres in width. After this it became rapidly smaller, as its branches were given ofi'. The portion of artery at the above angle was the part selected in the following experiments on increase of volume and arterial filling, the breadth of the artery being measured by a fine pair ARTERIAL FULNESS AND TENSION. 131 of callipers. But the rest of the vessel and the separate branches were also carefully noticed, and their greater or less prominence and visible extent and more or less sharply defined windings gave additional indications of the varying quantities of blood conveyed by them. 3. For indicating the pulse-c'wr've and determining the arterial tension, Sommerbrodt's loaded sphygmograph was chiefly used, but on the summits of mountains Marey's sphygmograph was found preferable on account of its portability and its easier indications (with ink). Sommerbrodt's apparatus has this advantage, thatadefinite pressure is employed in all investigations, and when the pulse-curves are larger a higher pressure is not required proportional to the greater tension. The loading was established once and for all at 200 grammes. Moreover the curve-forms which the very movable needle of this instrument makes upon a sooty surface are more exact, and their peculiarities are much better expressed than with Marey's instrument, the arcuate lines from which can often be explained only by a second observation with Sommerbrodt's. It need hardly be said that in all essential points the curves obtained from both...show more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236765982
  • 9781236765987