Wolff, Alfred R · New York, J. Wiley & sons · leaf 116
centre of the section bars are attached to a cylindricalfriction wheel placed on the rear of the hub. This fric-tion wheel consists of a curved spring, set for a givenspeed, which, when this speed is exceeded, is curled up,and retards the motion of the cylinder to which it isattached, thus causing… … Fig. 25. lOO THE WINDMILL AS A PRIME MOVER.
Windmills
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
