Weather masonry at the height of Torr Head was there to serve the custom house and as support for a spotting station where ships transiting the Strait of Moyle (Irish Sruth na Maoile), the 12 miles of water to the Mull of Kintyre.
Lloyd’s of London, vitally interested in the appearance of ships’ progress crossing the oceans, had notice of passage via semaphore (and, later, Marconi’s “wireless”). Destination ports were copied in.
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