Definitions

from The Century Dictionary and Cyclopedia

  • n. A cog-wheel in the form of a scroll, the effect of which is to cause the gearing to rotate more slowly when engaged with its main parts than when it is working in the outer parts.
  • n. A form of turbine water-wheel, in which the passages for the water and the buckets have a shape approximating that of a spiral or scroll.

Etymologies

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