Tesla's Transmission without Wires

Mr. Tesla announces in an American journal that by his well known system of transmitting intelligence by means of electrical "resonance" between points widely apart, without any connecting wires, he has lately been able to signal 20 miles. Mr. Tesla confesses, says the N.Y. Electrical Engineer, that the system is still liable to break down in bad weather, but such results will doubtless encourage him to persevere until the distance is many times greater, and the method is quite independent of disturbing atmospheric or terrestrial effects.