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SELF-RECOVERING COHERER
of wood, of ebonite and of pitch were interposed without checking the action. I then used polarised electric radiation, and interposed a book analyser, 6 cm. in thickness; when the analyser was held parallel, there was a vigorous action, but when it was held in a crossed position all action was stopped. No visible or heat radiation could have been transmitted through such a structure, and there can be no doubt that the action was entirely due to electric radiation.
(Proc. Roy. Soc., Apr. 1899.)
