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Certain properties of clean uranium in vacuum have been investigated. The following values were found: for emissivity below the melting point (λ=0.67{μ}), 0.51; for thermionic work function, 3.27±{}0.05 volts, with a Richardson A of about 6; for melting point, 1700±{}25^∘{}C; for average coefficient of linear expansion, 25^∘{}C to 1000^∘{}C, 4×{} 10^-5.
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Hole et al. (1939) studied this question.
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