Selection of opera glases, 1780-1820.

A selection of early draw tube refracting telescopes, early 18th century.

Achromatic telescope on portable equatorial stand, c 1769.

Dollond Microscope, early 19th century.

Crayon drawing of the Moon, 1796.

Pair of small Gregorian reflecting telescopes, mid 18th-mid 19th century.

Reflecting telescope, by James Watson, 19th century.

Equatorially mounted refracting telescope with dome, 1914.

Refracting telescope, 1870-80.

Refracting telescope of 3 1/4 inch aperture, 1800-1860.

Reflecting telescope with dome, 1900-1914.

'100-inch Reflecting Telescope, Mount Wilson Solar Observatory', c 1917.