 Pupils over eight years of age can do this; sometimes younger. Dustiness In high schools health officers can measure or estimate it by cultures, or by the " sugar method " recommended by the Committee on Standard Methods for the Examination of Air.  Transactions - Página 253por American Association for the Study and Prevention of Infant Mortality - 1914Vista completa - Acerca de este libro
 | National Education Association of the United States - 1913 - 848 páginas
...is an efficient department of biology or of home economics, dustiness can be measured or estimated by cultures or by the sugar method recommended by...inch objective) to a cubic inch of air. In elementary schools the method suggested for the present is that of the good housewife, wiping surfaces with a... | |
 | National Education Association of the United States. Meeting - 1913 - 844 páginas
...is an efficient department of biology or of home economics, dustiness can be measured or estimated by cultures or by the sugar method recommended by...inch objective) to a cubic inch of air. In elementary schools the method suggested for the present is that of the good housewife, wiping surfaces with a... | |
 | 1914 - 598 páginas
...particles were enumerated by counting the particles visible under a two-thirds inch objective, the method recommended by the Committee on Standard Methods for the Examination of Air of the American Public Health Association. This seemed to us preferable to the counting of ultra miscroscopic... | |
 | New York State Agricultural Experiment Station - 1916 - 1108 páginas
...liquid filters were used side by side. It was found that the particular form of sand-filter aeroscope recommended by the Committee on Standard Methods for the Examination of Air varied in its filtering efficiency from 50 to 100 per ct., with the average efficiency for two series... | |
 | New York State Agricultural Experiment Station - 1916 - 1106 páginas
...liquid filters were used side by side. It was found that the particular form of sand-filter aeroscope recommended by the Committee on Standard Methods for the Examination of Air varied in its filtering efficiency from 50 to 100 per ct., with the average efficiency for two series... | |
 | New York (State) Dept. of Agriculture - 1916 - 1104 páginas
...liquid niters were used side by side. It was found that the particular form of sand-filter aeroscope recommended by the Committee on Standard Methods for the Examination of Air varied in its filtering efficiency from 50 to 100 per ct., with the average efficiency for two series... | |
 | New York (State). Legislature. Senate - 1916 - 1120 páginas
...liquid filters were used side by side. It was found that the particular form of sand-filter aeroscope recommended by the Committee on Standard Methods for the Examination of Air varied in its filtering efficiency from 50 to 100 per ct., with the average efficiency for two series... | |
 | Henry Eastman Bennett - 1917 - 414 páginas
...recommended by the Committee on Standard Methods for the Examination of Air. The standard is two thousand particles (visible under a two-thirds inch objective)...and furnishings should be as immaculate as in the best-kept home or hospital. This test should come at the beginning of the session. Health officers... | |
 | Henry Eastman Bennett - 1917 - 412 páginas
...windows to secure proper temperature, which, when artificial heat is used, should never exceed 68° F. Pupils over eight years of age can do this ; sometimes...Methods for the Examination of Air. The standard is two thousand particles (visible under a two-thirds inch objective) to a cubic inch of air. In elementary... | |
 | National Association of School Accounting Officers - 1917 - 70 páginas
...schools which have departments of biology or home economics, dustiness can be measured or estimated by cultures, or by the sugar method recommended by...Committee on Standard Methods for the Examination of Air of the American Public Health Association. In elementary grades dustiness can be tested daily at the... | |
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