In 1841 photography pioneer Henry Talbot patented the calotype, slashing this time to minutes
[DOC] [TLE] Full text of "Looking At Photographs: A Guide To Technical Terms" [PAR] William Henry Fox Talbot's calotype process for the making of paper ... in 1840 
and patented in 1841, was the direct ancestor of modern photograph) as it was a 
... to ten minutes was necessary, depending on the weather, time of day, intensity 
of the ......