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
One of two profile gauges with concave profile which was used by the 3rd Earl of Rosse to measure the 72 inch mirrors used on the largest Rosse telescope. Profile gauge with concave profile
Brass disc with diagram of inner Solar System showing Thomas Wright's "construction" of the Great Comet of 1744