1840 camera invention on that made portraits a possibility. This made exposure time to as low as a few minutes in bright sunlight, and since a person could be still for that long it make portraits possible using this state-of-the-art photography. Beard then opened the first public portrait studio of Europe in London in March 1841, the Daguerrean gallery at the Polytechnic Institute. Beard developed franchises of portrait studios throughout England. Later life Johnson died on May 3, 1871, in Saco, Maine. References Sources Category:1813 births Category:1871 deaths Category:People from Saco, Maine Category:People from Pembroke, New Hampshire Category:19th-century American inventors Category:American photographers