A new device for the automatic application of molluscicide to streams

摘要

A new apparatus has been developed for the application of molluscicides to flowing streams. It is automatic in the sense that, once operation has been started, the rate of discharge of the liquid feed remains proportional to the stream flow, so that a constant concentration dosage of chemical is obtained. The unit employs a Sutro weir for stream flow measurement, and a simple diaphragm valve controls the rate of gravity feed from portable storage barrels.