A transistorised liquid helium capacity
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Ya.I. Rosenberg; V.G. Kasatkin
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Article
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1964
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Elsevier Science
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English
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The para concentration of the hydrogen was measured with a heat conductivity gas analyser using a bridge circuit. 3 The gas analyser was calibrated with the sensitive cells thermostatted at 77 ยฐ K, using four fixed points which fell on a straight line: 25 per cent parahydrogen (T---300 ยฐ K); 50-8 pe