John Cleves Symmes, Washington Arsenal, May 10, 1855; Vol. 2, p. 85; Reports of Tests and Experiments on Various Types of Ordnance and Ordnance Stories, 1820 – 183; 1846 – 61; Records Relating to Various Subjects, Experiments, 1812 -1913; Records of the Office of the Chief of Ordnance, Record Group 156; National Archives Building, Washington, D.C.
PHOTO: BRITTANY VENTURELLA
Evaluation of Gross' patent gun
by John Symmes, Washington Arsenal, 1855