Word: vacuum
(lookup in dictionary)
(lookup stats)
Dates: during 1930-1939
Sort By: most recent first
(reverse)
...paragraph, while their teachers endeavor to muddle them by conversing loudly. Later the class lasts longer-15 minutes for study, 15 for answers-with harder work to do: mathematical examples, psalms or poetry to be learned, a picture to be gazed at. The distractions get worse & worse: a vacuum cleaner buzzing, an alarm clock, a phonograph record...
Professor Emory L. Chaffe has done his principal work in the realm of electric oscillation and electric waves, with special reference to vacuum-tube phenomena. He has also devoted himself to biophysical problems, notably to a study of the electric response of the retina when stimulated by light...
...Apparatus for research in spectroscopy, sound, vacuum-tube phenomena, and electric response of the retina when stimulated by light...
...description of apparatus seen in foreign schools. At the conclusion of this, an opportunity will be furnished for the members of the association to inspect some of the interesting features of the new research Laboratory, such as the 100,000 volt storage battery, Professor Lyman's ultra-violet vacuum spectograph, Professor Duane's X-ray spectograph, and Professor Bridgman's high pressure apparatus...
Died. William H. Hoover, 82, philanthropist, founder and board chairman, of Hoover Co. (vacuum cleaners); after a short illness; in Canton, Ohio. His eldest son, Herbert W. (no kin to Herbert Clark Hoover), is president of the concern. Founder Hoover developed the vacuum cleaner from a friction sweeping device invented by a Cleveland janitor who, having asthma, hated dust...