 The residue is poured into an 11-cm. porcelain evaporating dish and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity. Evaporation is carried on at a gentle heat, with continual...  Bulletin - United States, Office of Public Roads - Seite 25von United States. Bureau of Public Roads - 1908Vollansicht - Über dieses Buch
 | Thomas Bliss Stillman - 1916 - 790 Seiten
...evaporating dish, and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity. Evaporation...on at a gentle heat, with continual stirring, until forming practically ceases. It is advisable to have a large watch glass at hand to smother the flames... | |
 | Arthur Horace Blanchard - 1919 - 1692 Seiten
...evaporating dish, and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity. Evaporation...the heat of the steam bath may be gradually raised, und evaporation is continued until the bubbles beaten or stirred to the surface of the bitumen fail... | |
 | Arthur Horace Blanchard - 1919 - 1710 Seiten
...evaporating dish, and evaporated on a steam bath. The most scrupulous care must lie taken at all times that no flames are in its immediate vicinity. Evaporation...As the foaming subsides, the heat of the steam bath maybe gradually raised, and evaporation is continued until the bubbles beaten or stirred to the surface... | |
 | William Allen Hamor, Fred Warde Padgett - 1920 - 620 Seiten
...with continual stirring, until foaming practically ceases. It is advisable to have a large watch-glass at hand to smother the flames quickly should the material ignite. As the foaming subsides, the heat of the steam-bath may be raised gradually, and evaporation is continued until the bubbles beaten or stirred... | |
 | 1922 - 1362 Seiten
...evaporating dish and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity. Evaporation is carried on at a gentle heat, with cootinual stirring, until foaming practically ceases. It is advisable to have a large watch glass at... | |
 | John Henry Bateman - 1928 - 442 Seiten
...evaporating dish and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity. Evaporation...steam bath may be gradually raised, and evaporation continued until the bubbles beaten or stirred to the surface of the bitumen fail to give a blue flame... | |
 | Edward Ezra Bauer - 1928 - 408 Seiten
...evaporate on a steam bath. Carry on evaporation at a gentle heat, with continual stirring, until foaming ceases. It is advisable to have a large watch glass...smother the flames quickly should the material ignite. 24. As the foaming subsides, gradually raise the heat of the steam bath and continue evaporation until... | |
 | 1928 - 1174 Seiten
...evaporating dish and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity Evaporation...steam bath may be gradually raised, and evaporation continued until the bubbles beaten or stirred to the surface of the bitumen fail to give a blue flame... | |
 | 1930 - 722 Seiten
...evaporating dish and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity. Evaporation...steam bath may be gradually raised, and evaporation continued until the bubbles beaten or stirred to the surface of the bitumen fail to give a blue flame... | |
 | John Quayle Cannon, Addams Stratton McAllister - 1930 - 706 Seiten
...evaporating dish and evaporated on a steam bath. The most scrupulous care must be taken at all times that no flames are in its immediate vicinity. Evaporation...to have a large watch glass at hand to smother the flamee quickly should the material ignite. As the foaming subsides, the heat of the steam bath may... | |
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