Webb, Burden, Robinson & Webb
Nozzle condition monitor
 A nozzle condition monitor for detecting the adequacy of the flow through a fertilizer application nozzle. The monitor comprises a nonmagnetic housing having an up-right passage. Within the passage, a magnetic piston is arranged as the flow may take place along the sides of the piston. Stoppers are arranged to restrict travel of the piston. A magnetic switch is arranged near one end of the up-right passage to be closed when the piston is moved against the stop at that end. Means for detecting the condition of the magnetic switch generate a signal indicative of the adequacy of the flow through the nozzle and therefore the condition of the nozzle. 
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Jack W.
Anderson