Word: suction
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...roots acted as a pump from below. The trouble with this was that no pressures could be measured higher than 1.4 atmospheres, which would not do for trees taller than 46 feet. Lately accepted as the most satisfactory explanation is the cohesion theory, in which it is supposed that suction created at the top by evaporation is transmitted through a cohering column of water under tension all the way down to the roots...
...cohesion theory cannot be entirely shelved, because water will rise in stalks from which the roots have been cut away, indicating suction from above. But Dr. White, speaking at the American Association for Advancement of Science convention in Indianapolis, showed clearly enough that root pressure could serve as an adequate explanation for sap transportation in the tallest known trees, and to that extent botanical theory must be revised. His colleagues considered his announcement so important that they awarded him the annual $1,000 prize conferred for the best paper among hundreds at the A. A. A. S. midwinter meeting...
...magazine cover showing the bare, potted back of a man undergoing "suction cup" treatment will fascinate, arrest, sell itself to at least 800,000 people who see it on the newsstands this week. At any rate, that is the hope of Adman John Stirling Getchell, mainspring of the new picture magazine Picture...
...respirators consists of a copper hood which fits over the patient's abdomen from hips to ribs; the other of an aluminum hood which covers the entire torso from hips to collar bone. Intermittent air suction in the abdominal hood expands and contracts a patient's lungs by forcing his diaphragm up and down. Similar suction in the torso hood compels breathing by moving both the diaphragm and the chest wall...
Fifteen times every minute a suction pump creates a slight vacuum within the respirator. This lifts Fred Snite's chest and pulls one pint of fresh air into his lungs. When the pump releases the vacuum, his chest falls and he exhales. Every time the machine inhales for him, the rubber ruff hugs his neck, and it was a long time before he learned to ignore the sensation of being throttled 21,600 times a day. Another annoyance to be ignored was the incessant throbbing of the pump. But he quickly learned to control his tongue and prevent...