The engineer's sketch-book of mechanical movements, devices, appliances, contrivances and details employed in the design and construction of machinery for every purpose

by Thomas Walter Barber

Section 95.—WINDMILLS AND FEATHERING WHEELS.

[1752]. Feathering paddle wheel. Each float has a bracket and pin at back, with connecting rod to a common eccentric (fixed), through which the shaft revolves.

[1753]. Spiral vane or cowl, for chimney top. Used to drive a vertical worm inside the chimney cap to maintain an upward draught, by employing the wind as a motive power.

[1754]. Windmill sails, with angular adjustment by a sliding device on the shaft.

[1755]. Feathering horizontal windmill. Each float is hinged a little out of centre to the arms, so that the pressure of wind (see arrow) turns the floats to the positions in the sketch as they revolve.

[1756]. Hollow semi-spherical cup windmill or motor.

[1757]. Wind motor, with curved vanes. These last two revolve in the direction of the arrows, because the wind has more hold upon the hollow sides of the cups and vanes than on the convex side.

[1758]. Self-feathering wind wheel.

[1759]. Spiral wind wheel.

[Larger plate.]