| 摘要 |
<p>A windmill has a device for influencing the directing of the vanes (1) thereof, wherefor each vane is mounted on a rotatable shaft (2), said device being comprised for each rotatable shaft, of an arm (21) made fast at right angle to said shaft and subjected to the centrifugal force, whereby means are provided to slow-down progressively that rotation of said shaft caused by said arm rotating.</p> |
