In 1636, Meldrum was granted by letters-patent from the king licence to continue and renew the lighthouses erected by Charles I on the North and South Forelands.
It was used by Guglielmo Marconi during his work on radio waves, receiving the first ship-to-shore message from the East Goodwin lightship, the first ship-to-shore distress message (when a steamship ran into the same lightship, and the lighthouse relayed the message up the coast to the Walmer lifeboat), and the first international transmission (from Wimereux, France, in 1899).
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Much of the contribution of the Knott family to lighthouse keeping was made at South Foreland Lighthouse where members oversaw many changes in lighting technology from coal fires to oil burning lights.