Definitions

from The Century Dictionary and Cyclopedia

  • n. A form of nephoscope, devised by Fornioni in 1881, consisting essentially of a magnetic compass containing, above the needle, a circular plane mirror on which are drawn radial lines corresponding to the wind-rose. A rod with terminal sighting-eye or knob is pivoted to the edge of the mirror. The observation consists in keeping the reflections of the sight-point and of the cloud coincident as they pass from the center of the mirror off to the edge.

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