Swath marker for field spraying device

Claim 1

A vehicle for applying agricultural chemicals to the soil, comprising: a. a mobile frame that may be propelled over the soil; b. an elongated spray boom mounted on the frame transversely to the direction in which the mobile frame is to be propelled; c. a large storage tank mounted on the frame for containing a large quantity of agricultural chemicals; d. a plurality of agricultural chemical spray nozzles mounted along the spray boom and operatively connected to the large storage tank for directing a wide swath of agricultural chemicals onto the soil as the mobile frame is propelled over the soil, in which the improvement comprises a marking device for visibly designating a swath, in which the marking device includes: e. a small storage tank mounted on the frame containing marking liquid; f. a marking liquid spray nozzle mounted on the spray boom adjacent one end of and operatively connected to the small storage tank; g. a solenoid operated diaphragm pump mounted on the movable frame for pumping marking liquid from the small storage tank to the spray nozzle; h. a relay electrically connected to the solenoid for activating the solenoid operated pump; and i. an adjustable timer that is electrically connected to the relay to activate the relay at desired intervals to operate the diaphragm pump to pump fluid at the same interval through the nozzle and onto the soil to provide spaced liquid marking spots alongside the agricultural liquid swath to clearly designate the swath.