| 摘要 |
Each of two chambers separated by a movable partition is connected to one of the two lines. The discharge nozzle on one line can be controlled by a valve which is connected to the partition and acts directly or indirectly on an indicator device. One or each of the two lines have at least one additional circular discharge nozzle. The ratio of the sum of the peripheral lengths of the discharge nozzles in each of the two lines is equal to the ratio of the cross-sectional surfaces of the intake nozzles in each of the two lines. |
