Glass block, shaped like half a lens

Glass block

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Glass block
Science Museum Group
© The Board of Trustees of the Science Museum

Glass block, shaped like half lens but probably not for optical use, in leather case, made 1850-1924 (Wellcome No. B875)

Details

Category:
Optics
Collection:
Sir Henry Wellcome's Museum Collection
Object Number:
1997-1953
Materials:
wood (unidentified), brass (copper, zinc alloy), glass, felt, paper (fibre product), leather and cardboard
Measurements:
overall (case closed): 29 mm x 63 mm x 43 mm, 0.062kg
overall (case open): 24 mm x 63 mm x 83 mm, 0.062kg
type:
optical glass
credit:
Wellcome Trustees