"Time,", undated Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undated
Undated Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series I: Correspondence of John K. Rees, 1880-1902
V-Z Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series II: Correspondence of Harold Jacoby, 1888-1913Subseries II.2: Jacoby's Letter File, approximately, 1888-1891
"Weighing the Earth" Request Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series IV: Writings of Harold Jacoby, approximately 1908-1911, undatedApproximately, 1909
Zenith Telescope, Variation of Latitude Investigation, volume 2, 1893-1899 Request Abstract Or Scope Definitive investigation of the periodic errors of the Zenith telescope screw, 1896. Computations by F.E. Harpham under the direction of Harold Jacoby. Includes additional computations by J.K. Rees and H.S. Davis. view more view less Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917
Zenith Telescope, Variation of Latitude Investigation, volume 3, 1893-1900 Request Abstract Or Scope Latitude observations, variation of latitude pairs, and reduction to apparent place. view more view less Collection Context Columbia University Archives Department of Astronomy records, 1880-1917Series V: Observatory Ledgers and Astronomical Reports, 1896-1917