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Published online by Cambridge University Press: 25 April 2016
The observations were made with a stellar spectrometer containing a Cashman PbS cell as receiver constructed in 1946 for the 82-inch telescope. The radiation is interrupted 1080 times per second; the small A.C. signal produced by the cell as a result of the fluctuating resistance and 90 V. D.C. voltage is amplified up to 30 million times, rectified, and recorded on a D.C. milliammeter.
page no 441 note * Phys. Rev. 73, 519, 1948; Ap. J. 107, 400, 1948.
page no 441 note † Phys. Rev. 74, 112, 1948.
page no 441 note ‡ Phys. Rev. 73, 1203, 1948.
page no 441 note § Ap. J. 90, 627, 1939; 93, 509. 1941.
page no 441 note ‖ Phys. Rev. 74, 352, 1948.
page no 441 note ¶ Ap. J. 94, 451, 1941.
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