London:: Macmillan, 1897., 1897. 8vo. xii, 339,  pp. 143 figs., index. Original dark green blind- and gilt-stamped cloth; spine ends worn. Very good. Rare. First edition in English, translated by W.F. Magie. Christiansen was a Danish physicist He was a member of the Royal Swedish Academy, and the doctoral advisor of Niels Bohr.
(Inventory #: RW1354)
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