Paris: Gauthier-Villars, 1890. 1st Edition. ORIGINAL PAPER WRAPS, FIRST EDITION, OF THE DISCOVERY OF THE BRANLY EFFECT & THE INVENTION OF THE ‘COHERER’, THE FIRST WIDELY USED SIGNAL DETECTOR FOR RADIO COMMUNICATION. The paper offered here is housed in a custom pamphlet case. Note that we offer Bose's "iron-mercury-iron coherer.....
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