| 摘要 |
A control unit for automatic watering of flowers includes a water reservoir connected by a tubular line to a water discharge device to be inserted into the soil. The humidity of the soil is maintained at a constant value by a control unit connected in the line between the water reservoir and the water discharge device. The control unit comprises a volume of air in a closed chamber between two vertical columns of water. The mouth of the supply line enters the closed air chamber at a level higher than that of the opening leading to the discharge device.
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