| 摘要 |
<p>A sprinkler including a first portion arranged to lie along a generally vertical axis, a second portion arranged to rotate about the generally vertical axis relative to the first portion and to be displaced along the generally vertical axis responsive to impingement of a water stream thereon, at least a first magnet associated with the first portion and at least a second magnet associated with the second portion, the first and second magnets being magnetized to repel each other at least generally along the generally vertical axis.</p> |
