Snelling, Henry Hunt, 1816-1897 · [New York : W.B. Smith] · leaf 336
d by manyof the more striking characters of light.Yet we have no account of their havingobserved any of its chemical influences,although its action on colored bodies—deepening their color in some cases, anddischarging it in others—must have beenof every-day occurrence. The only factswhich they have… … thority---that the jugglers of India werefor many ages in possession of a secret pro-cess, by which they were enabled in a briefspace to copy the profile of any individual,by the action of light. However this mayhave been, it does not appear that theyknow anything of such a process in thepresent…
Photography · Art and photography
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