1781-1868, natural philosopher and academic administrator, Scottish; British Brewster, Sir David 1781 - 1868
1781-1873, instrument maker; artist; optical inventor, English; British Varley, Cornelius 1781 - 1873
active, 1810-1837, optician, mathematical & philosophical instrument maker, Dublin, Ireland Mason, Thomas 1781 - 1837
1781-1826, physician; inventor of the monaural stethoscope, French Laennec, René Théophile Hyacinthe 1781 - 1826