This is a 19th Century photograph of Isambard Kingdom Brunel and (Robert?) Stephenson. It was taken by Robert Howlett and is now held by the San Francisco Museum of Modern Art.
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Brunel, Stephenson, and Three Unknown Men
Artwork
Artist
Robert Howlett
Robert Howlett is an 19th Century photographer, most famously known for his pictures of engineer Isambard Kingdom Brunel. Robert Howlett died in 1858 most likely due to exposure from the chemicals used to develop his photographs.