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
Glass diapositive in passe-partout frame [X14] of a drawing by Mr Wesley [plate 14] showing the solar corona as seen from Sfase, Tunisia at the solar eclipse of August 30th, 1905. Glass diapositive of a drawing showing the solar corona at the eclipse seen from Tunisia
Experimental speculum of 6 inches aperture and 24 inches focal distance, cracked across and bound together with string Experimental speculum of 6 inches aperture and 24 inches focal distance
Planispheric astrolabe by Gualterus (Walter) Arsenius, Louvain, c. 1570 in brass gilt with four plates for the latitudes of 25 with 28, 31 with 34, 37 with 38, and 39 with 40 degrees, IC 228 [International Checklist]. The reverse side is supplied with a Gemma Frisius universal projection scale and a compass square in the base of the womb. Planispheric astrolabe by Gualterus (Walter) Arsenius
One of two profile gauges with convex 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 convex profile