John G.D. Knight by G.K. Warren Mount measures 13 X 10 in. Snow graduated from West Point in 1868 and is shown here in his West Point uniform from 1868. Knight spent Forty-two years as an Army Engineer, about a quarter of his career spent on New York Harbor; taught seven years at the Military Academy. Signed on the front.

https://penelope.uchicago.edu/Thayer/E/Gazetteer/Places/America/United_States/Army/USMA/Cullums_Register/2220*.html