| 摘要 |
<p>An objective of the present invention is to have the apex of a wind receiving body consistently face windward. A thread is attached to a first attachment point of a conical wind receiving body having an apex, with the wind receiving body hanging by the thread, and a thread which supports a weight is attached to a second attachment point which is opposite the first attachment point in the vertical direction with respect to the center axis of the cone and nearer to the apex of the wind receiving body than the first attachment point. The weight is image captured from below with a camera, and wind speed and wind direction are derived from the distance and direction which the weight has moved from a reference location due to the wind.</p> |
