Search our collection

Clear all filters
Image
Category
Maker
Object type
Place
Material
Date
Speculum Mirror, 1861

Speculum Mirror, 1861

1861
Optical parts of Lassell's telescope

Optical parts of Lassell's telescope

1840-1850
Optical parts of Lassell's telescope

Optical parts of Lassell's telescope

1840-1850
Oval shaped secondary speculum mirror with cover, from the 6-foot Rosse telescope

Oval shaped secondary speculum mirror with cover

1845-1850
Two plane speculums by Lassell, with Lassell's M.S. directions

Two plane speculums by Lassell

1840-1850
Elliptical plane mirror (diagonal flat for Newtonian telescope) minor axis 1 1/2", major axis 2" in (full) soldered in usual way to circular brass disc, cylindrical cover of brass 1 3/4" deep, cover of brass 1 3/4" deep, cover and brass disc inscribed 1 "A4"

Elliptical plane mirror (diagonal flat for Newtonian telescope) minor axis 1 1/2"

1780-1820
Two plane speculums and two polishers by Lassell, with Lassell's M.S. directions

Two plane speculums and two polishers by Lassell

1840-1850