A superconductive device that provides five fixed‐point reference temperatures near absolute zero has been developed at the National Bureau of Standards. The device, which will reproduce its transition temperatures within 1 millikelvin, is made from five high‐purity elements—lead, indium, zinc and cadmium—and provides fixed points near 7.2 K, 3.4 K, 1.2 K, 0.8 K and 0.5 K.
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© 1973 American Institute of Physics.
1973
American Institute of Physics
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