| 摘要 |
A mobile processing machine that processes and adds a liquid to the material over which it travels is provided with a pair of pulse type electrical tachometers, one driven by a liquid flow meter and the other by a machine part that rotates in proportion to the travel of the machine. The outputs of the tachometers are differentially applied to a milliameter, a contact making milliameter or a sensitive polarized relay which indicates the departure from the selected flow rate or which, through suitable solenoid operated valves controls the flow of the liquid to maintain a selected flow rate with respect to machine speed or to maintain a selected machine speed relative to flow rate.
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