Nature October 12th 1876
Dr Janssen is devising construction of an automatic
photographic revolver, which will take a photograph of the Sun every hour each
day of the year from sunrise to sunset. The photographs which will be taken
under cloudy conditions, will be useless so far as sunspots are concerned, but
they might be utilised for meteorological purposes.
The others will be kept and tabulated. The advantage of this
plan it will dispense with any observer and will obtain a mechanical
regularity. A communication will be made
very shortly to the Academy of Sciences on the invention which was suggested by
the discussion on the Transit of Venus.
It will be set to work in the physical observatory of Dr
Janssen.
www.theramblingastronomer.co.uk
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