Proceedings of the American Academy of Arts and Sciences, Том 48Metcalf and Company, 1913 Vol. 12 (from May 1876 to May 1877) includes: Researches in telephony / by A. Graham Bell. |
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... side tube attached for the reception of the quartz window . The thermopile was then pushed up exactly opposite the side tube and wedged in place with cork and cotton wool attached with shellac . The end of the side tube was flanged out ...
... side tube attached for the reception of the quartz window . The thermopile was then pushed up exactly opposite the side tube and wedged in place with cork and cotton wool attached with shellac . The end of the side tube was flanged out ...
Страница 8
... side the errors of observation . The energy cut off from the spectrum of a tungsten lamp by the crown glass would be of course very small , but perhaps not negligible , since as Schanz and Stockhausen have shown ( loc . cit . table VIII ...
... side the errors of observation . The energy cut off from the spectrum of a tungsten lamp by the crown glass would be of course very small , but perhaps not negligible , since as Schanz and Stockhausen have shown ( loc . cit . table VIII ...
Страница 15
... side of the photometer room . The coefficient of reflection of the mirror had previously been many times determined as the mirror had been in use for photometric work . The photometer was ready for use at any time simply by closing the ...
... side of the photometer room . The coefficient of reflection of the mirror had previously been many times determined as the mirror had been in use for photometric work . The photometer was ready for use at any time simply by closing the ...
Страница 16
... side tube and a quartz window so as to keep the arc as steady as possible without losing the ultra violet . To the same end it was found desirable to adjust a magnet behind the arc so as to keep it burning on the side of the carbons ...
... side tube and a quartz window so as to keep the arc as steady as possible without losing the ultra violet . To the same end it was found desirable to adjust a magnet behind the arc so as to keep it burning on the side of the carbons ...
Страница 31
... side of his distinguished father and in the same departments of science . He proved himself capable of doing So. Some may remember the speech made by him at the centennial celebration of the foundation of this Academy . He thanked the ...
... side of his distinguished father and in the same departments of science . He proved himself capable of doing So. Some may remember the speech made by him at the centennial celebration of the foundation of this Academy . He thanked the ...
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