Note 32 — PART II.—SYSTEMS CONTAINING ONLY A SINGLE NUCLEUS [23] [24].
Reading edition
C. and M. Cuthbertson, Proc. Roy. Soc. A. lxxxiv. p. 13 (1910). (In a previous paper (Phil. Mag. Jan. 1913) the author took the values for the refractive index in helium, given by M. and C. Cuthbertson, as corresponding to atmospheric pressure; these values, however, refer to double atmospheric pressure. Consequently the value there given for the number of electrons in a helium atom calculated from Drude’s theory has to be divided by 2.)