Washington, D

C. U.S. Naval Observatory. Long. from Green wich 5h. 8m. 12.04s. W., lat. 38° 53′ 38.8′′ N. (old observatory); 5h. 8m. 15.71s. W., 38° 55′ 14.7" N. (new observatory). Directors: M. F. Maury 1841, James M. Gilli 1861, Charles H. Davis 1865, Benjamin F. Sands 1867, John Rodgers 1874, Stephen C. Rowan 1882, Robert W. Shufeldt 1883, Samuel R. Franklin 1884, George E. Belknap 1885, Allan D. Brown 1886, Robert L. Phythian 1886, F. V. McNair 1890. Equatorial telescopes: aperture 26 in. by Alvan Clark & Sons, remounted by Warner & Swasey; aperture 9.62 in. by Merz; meridian circle by Pistor & Martins, aperture 8.52 in., remodeled by Saegmuller; meridian transit instrument by Ertel & Son, aperture 5.33 in.; mural circle by Trough ton & Simms; prime vertical transit instrument, remodeled by Saegmuller. Besides these, there is a large collection of instruments of le prominence. In 1892 the observatory was removed to a new site. The main building of the new establishment is an imposing structure of marble containing the offices, computing rooms and library. A separate building is provided for each of the principal instruments; those containing the meridian instruments are of iron. The cost, including repairing and remounting of instruments, was more than $500,000.