Silver-on-glass mirror of 9-inch aperture by G.H.With

Made:: 1865-1890

maker:: George Henry With

Silver-on-glass mirror of 9-inch aperture by G.H.With, plus driving clock from Canon Cross's equatorial Newtonian telescope (RAS No.141). Presented to the Royal Astronomical Society in 1900 by Mrs Cross.

Details

Category:: Astronomy

Object Number:: 1984-578

Materials:: glass, brass and wood

Measurements:: overall (estimate): 150 x 240 mm

type:: components, concave mirrors, glass mirrors and astronomical instruments

credit:: Royal Astronomical Society

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Parts

Silver-on-Glass Telescope Mirror

Silver-on-glass telescope mirror, 9-inch diameter, by George H. With, Hereford, from Canon Cross's equatorial Newtonian reflecting telescope, 1865-90. Mounted in brass mirror cell with lid, detached from rest of telescope.

Measurements:: overall (with cover): 190 mm x 230 mm x 230 mm, , 6.35kg

Materials:: brass (copper, zinc alloy) , glass , teak (wood) , steel (metal) , paper (fibre product) and mirror-glass (silvered)

Object Number:: 1984-578 Pt1

type:: components , concave mirrors and glass mirrors

Image ©: The Board of Trustees of the Science Museum

Clock drive from Canon Cross's equatorial Newtonian telescope

Clock drive from Canon Cross's equatorial Newtonian telescope.

Materials:: brass and steel

Object Number:: 1984-578 Pt2

type:: components and telescope drives (mechanical)

Case for silver mirror

Case for Silver-on-glass mirror of 9-inch aperture by G.H.With, plus driving clock from Canon Cross's equatorial Newtonian telescope (RAS No.141). Presented to the Royal Astronomical Society in 1900 by Mrs Cross.