A letter from the Navy Minister (1861) about the transfer of the Navy collections of instruments to Leiden Observatory, and two letters concerning the testing of compasses, 1861, 1873-1874, NIMH, MEOB, 075: 19
A letter from the Navy Minister (1861) about the transfer of the Navy collections of instruments to Leiden Observatory, and two letters concerning the testing of compasses, 1861, 1873-1874, NIMH, MEOB, 075: 19