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the moon in 1853, and constructed the Kew
photoheliograph in 1857, from which date
these instruments have been multiplied, and
have given us an accurate record of the sun’s
surface. Gelatine dry plates were first used
by Huggins in 1876.
It is noteworthy that from the outset
De la Rue recognised the value of stereo-
scopic vision, which is now known to be of
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