![The principles of physics. osed to an undulatory radiation corresponding to thesound-vibrations. The conductivity of selenium is susceptible torapid changes caused by slight changes of radiant energy fallingupon it. Hence a The principles of physics. osed to an undulatory radiation corresponding to thesound-vibrations. The conductivity of selenium is susceptible torapid changes caused by slight changes of radiant energy fallingupon it. Hence a](https://c8.alamy.com/comp/2AFPDW6/the-principles-of-physics-osed-to-an-undulatory-radiation-corresponding-to-thesound-vibrations-the-conductivity-of-selenium-is-susceptible-torapid-changes-caused-by-slight-changes-of-radiant-energy-fallingupon-it-hence-a-current-from-a-battery-b-passing-through-thecell-p-and-telephone-receiver-t-is-transformed-into-an-undulatorycurrent-corresponding-to-the-undulatory-radiations-received-by-thecell-the-undulatory-current-causes-the-disk-of-the-receiver-t-toemit-sound-waves-which-are-audible-to-the-ear-mercadier-by-introducing-a-cell-c-containing-a-solution-ofiodine-which-has-the-propert-2AFPDW6.jpg)
The principles of physics. osed to an undulatory radiation corresponding to thesound-vibrations. The conductivity of selenium is susceptible torapid changes caused by slight changes of radiant energy fallingupon it. Hence a
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