Spiral gearing
Spiral Spi"ral, a. [Cf. F. spiral. See {Spire} a winding line.] 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 parallel.

{Spiral operculum}, an operculum whih has spiral lines of growth.

{Spiral shell}, any shell in which the whorls form a spiral or helix.

{Spiral spring}. See the Note under {Spring}, n., 4. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • spiral gearing — noun see spiral gear …   Useful english dictionary

  • Spiral — Spi ral, a. [Cf. F. spiral. See {Spire} a winding line.] 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 Collaborative International Dictionary of English

  • Spiral gear — Spiral Spi ral, a. [Cf. F. spiral. See {Spire} a winding line.] 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,… …   The Collaborative International Dictionary of English

  • Spiral operculum — Spiral Spi ral, a. [Cf. F. spiral. See {Spire} a winding line.] 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,… …   The Collaborative International Dictionary of English

  • Spiral shell — Spiral Spi ral, a. [Cf. F. spiral. See {Spire} a winding line.] 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,… …   The Collaborative International Dictionary of English

  • Spiral spring — Spiral Spi ral, a. [Cf. F. spiral. See {Spire} a winding line.] 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,… …   The Collaborative International Dictionary of English

  • Spiral wheel — Spiral Spi ral, a. [Cf. F. spiral. See {Spire} a winding line.] 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,… …   The Collaborative International Dictionary of English

  • spiral gear — noun or spiral gearing : a helical gear used to transmit power between nonparallel shafts * * * 1. a type of helical gear used for transmitting power between shafts that are at an angle to each other. 2. See spiral bevel gear. * * * spiral gear …   Useful english dictionary

  • spiral head — noun : an index head whose spindle may be connected by gearing to the feed screw of a milling machine table for the purpose of cutting spirals …   Useful english dictionary

  • Worm gearing — Worm Worm (w[^u]rm), n. [OE. worm, wurm, AS. wyrm; akin to D. worm, OS. & G. wurm, Icel. ormr, Sw. & Dan. orm, Goth. wa[ u]rms, L. vermis, Gr. ? a wood worm. Cf. {Vermicelli}, {Vermilion}, {Vermin}.] [1913 Webster] 1. A creeping or a crawling… …   The Collaborative International Dictionary of English

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