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All of the values in this table were calculated by means of Wien’s equation with the exception of the last column, headed “5000x10$-15$” and that was calculated by means of Planck’s equation. The values show the correct relationships for different wave-lengths at a single temperature, and between different temperatures if multiplied by the factors which are placed at the heads of the several columns. See Forsythe, Ref. , pp. 330-331.