Who in 1838 invented stereoscopic apparatus?

James Maxwell
David Brewster
William Cooke
Charles Wheatstone
The original stereoscopic apparatus was invented in 1838 by Sir Charles Wheatstone from Gloucestershire, in the year of the birth of photography, yet his early experiments employed drawings instead of photographs, viewed through a system of angled mirrors.
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James Maxwell
David Brewster
William Cooke
Charles Wheatstone
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