Hall found one NGC object: the galaxy NGC 7693 in Pisces. He discovered it with the 26" refractor of the U.S. Naval Observatory, Washington D.C., on December 1, 1882; see AN 2394.

Obituaries: MNRAS 68, 243 (1908); PASP 19, 264 (1907); AN 177, 127 (1908)