Brass foot tool in painted tinplate case used by William Herschel to polish his metal speculum mirrors used in his telescopes. Brass foot tool in painted tinplate case 1770-1820
Pitch polisher used by William Herschel to polish his metal speculum mirrors used in his telescopes. Pitch polisher 1770-1820
Transparency, 40"x51 1/2", of Crab Nebula in Taurus (M.1. N.G.C. 1952) photographed in red light by the 200-inch Hale telescope Transparency, 40"x51 1/2"
Transparency, 15"x12", Modern Astronomers (from photo taken at Royal Observatory) Transparency, 15"x12", Modern Astronomers (from photo taken at Royal Observatory)
Transparency, 40"x51 1/2", of Spiral galaxy in Pegasus, N.G.C. 7217, photographed by the 200-inch Hale telescope Transparency, 40"x51 1/2"