Note 31 — Front matter (continued 2)
Reading edition
See Professor Minchin, Proc. Phys. Soc., November 24, 1893; or The Electrician, Vol. XXXII., 1893, p. 123. See also Professor Minchin, Phil Mag., January, 1894, Vol. XXXVII., p. 90, "On the Action of Electromagnetic Radiation on Films containing Metallic Powders."