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Published online by Cambridge University Press: 31 October 2008
The instrument is an ordinary dry and wet bulb hygrometer adapted to give a direct
reading of the percentage humidity. I, I are pointers set at the dry and wet bulb readings by means of pieces sliding on the rods A, B and joined together by a link C, which actuates by a slot the scale F (movable in the vertical) on which the percentage humidity is read at the pointer D.