XPROVED NDMILL. The main tower consists of an open framework with in which the floats of all wheels except the upper one revolve. In the center of the frame is a hollow shaft to which the arms carrying the floats are rigidly se cured ; each float is formed with trunnions which are mounted in bearings in the ends of the arms and each has two strips which project somewhat beyond the in ner face of the float and engage with stops carried by vertical rods arranged to move in apertures in the arms. The position of these rods is regulated by a governor. When the mill is revolving at too great speed
XPROVED NDMILL. The main tower consists of an open framework with in which the floats of all wheels except the upper one revolve. In the center of the frame is a hollow shaft to which the arms carrying the floats are rigidly se cured ; each float is formed with trunnions which are mounted in bearings in the ends of the arms and each has two strips which project somewhat beyond the in ner face of the float and engage with stops carried by vertical rods arranged to move in apertures in the arms. The position of these rods is regulated by a governor. When the mill is revolving at too great speed the governor arms are thrown out thereby rais ing the vertical rods so that their stops will be raised out of the paths of the projecting ends of the strips and the floats will be free to swing upon their pivotal WOOD'S IMPROVED WINDMILL. rative. As the speed decreases the governor arms drop the stops are lowered and the floats become ope rative. The upper section of the mill is formed with a series of stationary floats carried by arms rigidly secur ed to the hollow shaft. These floats are partially sur rounded by a curved shield carried upon a frame form ed with two projecting arms upon which are mounted vanes supported by shafts having at their inner ends pinions that are engaged by a cylindrical rack formed upon the upper end of a central shaft. Upon the lower end of this shaft is a grooved collar engaged by the pro jecting end of a lever whose position is controlled by a weight or by a pin inserted in one of a series of holes in the frame. The vanes are so arranged that when one is horizon tal the other will be vertical. When the first vane is in a vertical position the shield will be so held that the floats upon one side will be shielded from the action of the wind while those upon the other side will be exposed. Now as the speed of the mill increases the governor arms are thrown out the shaft and its cylindrical rack will be raised and each of the vanes partially rotated
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