Patent US3418458 - Visual indicating devices for aircraft - Google Patents
Sorry Skippie, yes the inventor was Capt AMA Majendie, as you say, the famous BOAC Comet Captain. The patent was assigned to us at Smiths and I saw him being shown round during a visit. I'm going gaga, henry.
PS - another name, John Butler, he had the most magnificent cigarette lighter made of a magneto which you cranked to produce a spark which lit a spirit burner. All beautifully painted and polished, mounted on a large paxolin base. Work of art.