Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 50
attached, al the lower entremity, a long thin strip of wood, tl I which run- in a direction transverse to the length of the -nip. I heupper end of thi- strip i- attached to the axis of the index(_, which points out the de) rei f saturation of thi- atmosphere A helical pring l» i- fastened at its… … i4 HYGROMETER. sphere, moves the index round accordingly, and thus indicates upon the graduated dial the ratio omoisture existing at the time being. The dew-point is readily found by firs! ascertaining the exact temperature at the time of observation,and from this subtracting the number indicated…
Mechanical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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