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 for Spiral wheel
From The Collaborative International Dictionary of English v.0.48 :

  Spiral \Spi"ral\, a. [Cf. F. spiral. See Spire a winding
     1. Winding or circling round a center or pole and gradually
        receding from it; as, the spiral curve of a watch spring.
        [1913 Webster]
     2. Winding round a cylinder or imaginary axis, and at the
        same time rising or advancing forward; winding like the
        thread of a screw; helical.
        [1913 Webster]
     3. (Geom.) Of or pertaining to a spiral; like a spiral.
        [1913 Webster]
     Spiral gear, or Spiral wheel (Mach.), a gear resembling
        in general a spur gear, but having its teeth cut at an
        angle with its axis, or so that they form small portions
        of screws or spirals.
     Spiral gearing, a kind of gearing sometimes used in light
        machinery, in which spiral gears, instead of bevel gears,
        are used to transmit motion between shafts that are not
     Spiral operculum, an operculum whih has spiral lines of
     Spiral shell, any shell in which the whorls form a spiral
        or helix.
     Spiral spring. See the Note under Spring, n., 4.
        [1913 Webster]

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