U.S. Coast and Geodetic Survey, Jones, Ernest Lester, 1876-1929 · Washington : Govt. Print. Off. · leaf 30
Fig.2._A FIELD ASTRONOMIC STATION AT WHICH THE LATITUD OBSERVED. E IS BEING Special Publication No. 38. … Fig. 3.—ZENITH TELESCOPE, USED IN THE DETERMINATION OF LATITUDE. Special Publication No. 38.
Charts, diagrams, etc
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
