Louise Georgina Daguerre (né Arrowsmith)
[Wife of Louis Jacques Mande Daguerre, b. 1810, d. 1857.]
He is always at thought; he cannot sleep at night for it. I am afraid he is out of his mind; do you, as a man of science, think it can every be done, or is he mad?
(1827, to chemist J.B. Dumas on her husband’s efforts to invent photography.) 
