Geometric lathe

Geometric \Ge`o*met"ric\, Geometrical \Ge`o*met"ric*al\, a. [L.
   geometricus; Gr. ?: cf. F. g['e]om['e]trique.]
   1. Pertaining to, or according to the rules or principles of,
      geometry; determined by geometry; as, a geometrical
      solution of a problem.
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   2. (Art) characterized by simple geometric forms in design
      and decoration; as, a buffalo hide painted with red and
      black geometrical designs.

   Syn: geometric.
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   Note: Geometric is often used, as opposed to algebraic, to
         include processes or solutions in which the
         propositions or principles of geometry are made use of
         rather than those of algebra.
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   Note: Geometrical is often used in a limited or strictly
         technical sense, as opposed to mechanical; thus, a
         construction or solution is geometrical which can be
         made by ruler and compasses, i. e., by means of right
         lines and circles. Every construction or solution which
         requires any other curve, or such motion of a line or
         circle as would generate any other curve, is not
         geometrical, but mechanical. By another distinction, a
         geometrical solution is one obtained by the rules of
         geometry, or processes of analysis, and hence is exact;
         while a mechanical solution is one obtained by trial,
         by actual measurements, with instruments, etc., and is
         only approximate and empirical.
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   {Geometrical curve}. Same as {Algebraic curve}; -- so called
      because their different points may be constructed by the
      operations of elementary geometry.

   {Geometric lathe}, an instrument for engraving bank notes,
      etc., with complicated patterns of interlacing lines; --
      called also {cycloidal engine}.

   {Geometrical pace}, a measure of five feet.

   {Geometric pen}, an instrument for drawing geometric curves,
      in which the movements of a pen or pencil attached to a
      revolving arm of adjustable length may be indefinitely
      varied by changing the toothed wheels which give motion to
      the arm.

   {Geometrical plane} (Persp.), the same as {Ground plane} .

   {Geometrical progression}, {proportion}, {ratio}. See under
      {Progression}, {Proportion} and {Ratio}.

   {Geometrical radius}, in gearing, the radius of the pitch
      circle of a cogwheel. --Knight.

   {Geometric spider} (Zool.), one of many species of spiders,
      which spin a geometrical web. They mostly belong to
      {Epeira} and allied genera, as the garden spider. See
      {Garden spider}.

   {Geometric square}, a portable instrument in the form of a
      square frame for ascertaining distances and heights by
      measuring angles.

   {Geometrical staircase}, one in which the stairs are
      supported by the wall at one end only.

   {Geometrical tracery}, in architecture and decoration,
      tracery arranged in geometrical figures.
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   3. The movable swing frame of a loom, carrying the reed for
      separating the warp threads and beating up the weft; --
      called also {lay} and {batten}.
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   {Blanchard lathe}, a lathe for turning irregular forms after
      a given pattern, as lasts, gunstocks, and the like.

   {Drill lathe}, or {Speed lathe}, a small lathe which, from
      its high speed, is adapted for drilling; a hand lathe.

   {Engine lathe}, a turning lathe in which the cutting tool has
      an automatic feed; -- used chiefly for turning and boring
      metals, cutting screws, etc.

   {Foot lathe}, a lathe which is driven by a treadle worked by
      the foot.

   {Geometric lathe}. See under {Geometric}

   {Hand lathe}, a lathe operated by hand; a power turning lathe
      without an automatic feed for the tool.

   {Slide lathe}, an engine lathe.

   {Throw lathe}, a small lathe worked by one hand, while the
      cutting tool is held in the other.
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