Device for supplying material with unit doses of parasiticidal composition

A device for supplying unit doses of particulate parasiticidal composition to material susceptible to parasite attack, comprising, in combination:

• (1) a supply of particulate parasiticidal composition;
• (2) means for gravity-feeding unit doses in regular sequence at timed intervals from the supply of the material;
• (3) means for sensing each unit dose as fed to the material comprising a capacitive approach switch which gives a pulse whenever a body passes the switch, and which is in operative connection with a monostable sweep circuit, and a counter in operative connection with said capacitive approach switch, counting the pulses emitted by the capacitive approach switch, and keeping a tally of the total;
• (4) means in the monostable sweep circuit for timing the interval between unit doses, and emitting a signal whenever the time interval between two succeeding pulses exceeds a predetermined interval of time;
• and
• (5) means controlled by said signal for giving an alarm indicating that the time interval between two succeeding pulses exceeds said predetermined interval of time.