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Knight's Mechanical Encyclopedia (ed. Knight), T. (search)
ed in a balanced tube is caused to make one or the other of its ends preponderate, in order to open and close a window or damper. See page 216. Barometrical thermometer; a form of boiling-point apparatus for measuring hights, invented by Dr. F. Wollaston. See Hyp-Someter, Fig. 2631, page 1160. Chemical thermometer; one so contrived that its scale is kept out of contact with coloring or corrosive liquids when these are being tested. Clinical thermometer; one used for detecting the heatme, and the warps are governed by the Jacquard arrangement. A three-ply carpet. Trip′lel-shov′el plow. A cultivator-plow with three shovels. Trip′let. （Optics.) An arrangement of lenses in a microscope, invented by Holland. In Wollaston's doublet two plane concave lenses were used, but in Holland's two lenses are substituted for the first in the doublet, and the stop is placed between them and the third lens. The object is the correction of spherical aberration and chromatic
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