1) John Wesley Frazerb
Bonus Answer: A buggy converted into a mobile darkroom and travelling studio in the field. Could belong to Matthew Brady and taken at Gettysburg
Regards
David
Bonus:
Not quite sure what is expected as reply.
So here comes my answer no.1:
It is a "What is it Wagon", for processing photos on location. It is an ordinary delivery cart, similar to a butcher's cart, with a door hung on the back to make it light-proof. The process of developing a single photo usually only took a few minutes, but in the freezing cold, could take up to an hour.
Should the question ask about this special wagon, here comes my answer no. 2:
According to this source the photo shows the Matthew Brady photo crew outside Petersburg, VA in 1864.
The bonus question shows a battlefield photographer's (Alexander Gardner?) darkroom wagon, with his two assistants (one of whom is likely Timothy O'Sullivan) seated on the ground beside it while a servant holds the horses still.
John Wesley Frazer (6 January 1827 – 16 March 1906)wiki/John_W._Frazer
BONUS: The LOC labels this image as "Brady's photo outfit in front of Petersburg, Va. 1864(?)" https://www.loc.gov/item/2012649239/ Presumably, the image depicts Matthew Brady, an assistant, a hostler (holding the horse), Brady's wagon containing his photo processing set-up.
bonus: Civil War photographer Mathew Brady seated, left, with the wagon and equipment he used to photograph scenes on the battlefield, Petersburg, Virginia, 1864.
John Wesley Frazer
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Bonus: Mathew Brady Photo Crew photographers van filled with glass plates, chemicals, and developing equipment near Petersburg, Virginia circa 1864.