Abstract
SO far as I have seen there is in use at present but one form of apparatus which effects an automatic registration of the duration and the times of sunshine, and that is the instrument of Campbell, in which a sphere of glass is so disposed as to burn a piece of wood or paper by the concentration of his rays when the sun may chance to shine. During the past few years I have devoted some attention to this matter and devised a number of appliances having the same object for their end but differing materially both in their construction and in the manner of their use from the apparatus I have named.
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Recording Sunshine 1 . Nature 21, 214 (1880). https://doi.org/10.1038/021214a0
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DOI: https://doi.org/10.1038/021214a0