| 摘要 |
<p>The automatic waterer is for gardens etc. the water being delivered from the mains to a circuit in which the water is treated if necessary, and from that to the irrigation circuit on the ground. Water is delivered periodically and automatically from the mains, at set intervals and for set periods. The pressure can be regulated by lowering it between two circuits, and fertiliser from a storage vessel can be delivered into the water in the first circuit.</p> |
