File:British patent 11575 Lodge IMPROVEMENTS IN SYNTONIZED TELEGRAPHY May 10 1897 fig 3 & 4.png

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Captions

Captions

Circuit of Oliver Lodge's spark radio transmitter and receiver

Summary

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Description
English: Two circuit schematics from British physicist Oliver Lodge's 10 May 1897 patent, showing his "syntonic" wireless telegraphy radio transmitter (bottom) and receiver (top). This patent was important because it was the first radio system with resonant circuits in the transmitter and receiver which were tuned to resonance with each other. When it was renewed in 1911 the Marconi Wireless Telegraphy Co. was forced to buy it from Lodge, to protect its own tuned radio system from suits.
Date
Source Retrieved 9 March 2018 from British patent no.189711575 Oliver Lodge, Improvements in Syntonised Telegraphy without Line Wires, applied: 10 May 1897, accepted: 10 August 1898 on Espacenet.com
Author Oliver J. Lodge

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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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