Roger is right, get a manual about calibration and get a nozzle chart. If you accurately know your tractor speed and have an accurate pressure gauge you can be pretty close. I have a 1000 gallon field sprayer with a 60 foot boom and a monitor that puts on any rate I tell it and I admit it has spoiled me. I also have an old 200 gallon sprayer with a ten foot boom for fence lines and small grass areas. That rig is a shot in the dark when it comes to knowing how much I am applying. This fall I made a lawn sprayer with a six foot boom for the lawn mower. I had no idea how fast I was going so I downloaded a speedometer app on my smartphone to solve that problem. I went by a nozzle chart and this speedometer app on the cell phone and ended up hitting the nail on the head with the application rate.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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