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Spiral spring   /spˈaɪrəl sprɪŋ/   Listen
adjective
Spiral  adj.  
1.
Winding or circling round a center or pole and gradually receding from it; as, the spiral curve of a watch spring.
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.
3.
(Geom.) Of or pertaining to a spiral; like a spiral.
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.





Collaborative International Dictionary of English 0.48


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"Spiral spring" Quotes from Famous Books



... other prong extends upward and catches under a projection of the steam tube, and forms the fulcrum for the lever. The opposite end of this lever is provided with an adjustable screw pressing upon a plate that rests on the top of a spiral spring, which keeps the valve closed by pressing the outer end of the lever upward. As soon as the pressure of the steam overcomes the pressure of the spiral spring the valve will be raised, permitting the steam to escape. The apparatus is contained in a ...
— Scientific American, Volume XLIII., No. 25, December 18, 1880 • Various


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