ScienceJohn Michels (Journalist) 1943 |
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Page 12
... means of producing for the first time continuous high frequency oscillations by means of a thermionic tube . He filed applications on this invention in the latter part of 1913 and a patent was is- sued to him on October 6 , 1914. In ...
... means of producing for the first time continuous high frequency oscillations by means of a thermionic tube . He filed applications on this invention in the latter part of 1913 and a patent was is- sued to him on October 6 , 1914. In ...
Page 197
... means of collecting references to papers in a narrower field is essential . This is usually accomplished by a card file of some sort . For a number of years the present writer has been clipping from two of the sec- tions the abstracts ...
... means of collecting references to papers in a narrower field is essential . This is usually accomplished by a card file of some sort . For a number of years the present writer has been clipping from two of the sec- tions the abstracts ...
Page 499
... means of germicidal lamps installed in schoolrooms . This study , which extended over a five - year period and included observations on a large number of children in three schools , showed that the incidence of measles , in particular ...
... means of germicidal lamps installed in schoolrooms . This study , which extended over a five - year period and included observations on a large number of children in three schools , showed that the incidence of measles , in particular ...
Contents
VOL | 1 |
CASE G W Engineering Colleges and War 79 | 10 |
Health Service A SEIDELL | 14 |
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