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Direct sunshine) duration of measurement apparatus / sonnen recorder / helio graph
Direct sunshine) duration of measurement apparatus / sonnen recorder / helio graph
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机译:阳光直射)测量仪器的持续时间/声波记录仪/日光图
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摘要
An apparatus for measuring the period of sunshine characterized in that the sun by a suitable fuel to a suitable medium ball of the channel impresses or. The ball can be made of glass, the medium consists of paper.
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