Annual Report of the Board of Regents of the Smithsonian InstitutionThe Institution, 1921 |
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Сторінка 157
... clear sky , and the nights were usually clear . The colostat was mounted on a stone pier built for the purpose . The clock weight fell into a pit below the clock deep enough to allow a run of 36 minutes without rewinding . Care was ...
... clear sky , and the nights were usually clear . The colostat was mounted on a stone pier built for the purpose . The clock weight fell into a pit below the clock deep enough to allow a run of 36 minutes without rewinding . Care was ...
Сторінка 250
... clear at a high tem- perature and " strike " opal on cooling . To what extent the glass has to be cooled before becoming opal depends on the concentration of the particular opal - producing compound which is held in solution in the very ...
... clear at a high tem- perature and " strike " opal on cooling . To what extent the glass has to be cooled before becoming opal depends on the concentration of the particular opal - producing compound which is held in solution in the very ...
Сторінка 253
... clear and colorless glass , and the greater the concentration of the coloring agents , the more sudden must the chilling be to secure this result . On reheating these colorless glasses they , like the opals , " strike " and yield the ...
... clear and colorless glass , and the greater the concentration of the coloring agents , the more sudden must the chilling be to secure this result . On reheating these colorless glasses they , like the opals , " strike " and yield the ...
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Bureau of American Ethnology | 17 |
Report on the United States National Museum | 25 |
EXECUTIVE COMMITTEE AND REGENTS | 100 |
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