“… an undercurrent of thought was going on in my mind which gave at last a result, whereof it is not too much to say that I felt at once the importance. An electric circuit seemed to close; and a spark flashed forth the herald (as I foresaw immediately) of many long years to come of definitely directed thought and work by myself, if spared, and, at all events, on the part of others if I should even be allowed to live long enough distinctly to communicate the discovery. Nor could I resist the impulse - unphilosophical as it may have been - to cut with a knife on a stone of Brougham Bridge, as we passed it, the fundamental formula which contains the Solution of the Problem, but of course, as an inscription, has long since mouldered away.”

— William Rowan Hamilton

in a letter to his son (dated August 5, 1865), describing his discovery of quaternions on October 16, 1843, in Robert Perceval Graves, Life of Sir William Rowan Hamilton Vol. 2 (1885) https://archive.org/details/lifeofsirwilliam02gravuoft, pp. 434-435.

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William Rowan Hamilton 4

Irish physicist, astronomer, and mathematician 1805–1865

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