prime vertical dial


From The Collaborative International Dictionary of English v.0.48:

Vertical \Ver"ti*cal\, n.
   1. Vertical position; zenith. [R.]
      [1913 Webster]

   2. (Math.) A vertical line, plane, or circle.
      [1913 Webster]

   Prime vertical, Prime vertical dial. See under Prime,
      a.
      [1913 Webster]
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