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. Full text Full text is available as a scanned copy of the original print version. Get a printable copy (PDF file) of the complete article (772K), or click on a page image below to browse page by page. Links to PubMed are also available for Selected References . 237 238 239 240 241 242
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