[1607]. Variable throw crank pin by means of a jointed crank and radial adjusting screw.
[1608]. Variable throw crank pin by attaching the crank pin to an eccentric disc. See [Section 10].
[1609]. Wind motor-fan or turbine, with variable-angle vanes actuated by a central sleeve and cam or lever gear.
[1610]. Variable friction cone gear; the small friction pinion can be moved radially to and fro to alter the leverage and consequently speed of driving radius from the cone.
In the steam engine, compressed air engine, and gas engine (these being all elastic fluids), the power given out is varied by altering the supply of steam, air, or gas. In the water wheel the power may be varied by altering the quantity of water (or head of water) supplied to the wheel. In the turbine the power can be varied by altering the head of supply water and the angle of vanes; altering the quantity reduces the speed and efficiency. The turbine will not work well under great variations of either head or quantity.
See also [Nos. 736], [722], [723], [1190], [1191], [381], [382], [384], [385], [377], [372], [373]; and [Sections 20] and [40].
For variable pressure or tension by springs, see [Section 80].
Variable balance weights, [Section 20].