I have an old Delaval vacuum pump from that era, can't think of the model number now but it is old enough it has steel veins not fiber like anything in the last 40 years. It is just a normal vacuum pump that we used to run pneamatic pulsators on either surge or delaval buckets. I think I know what you are asking about, I think they are actualy from the 60s, the back of the pump had a generator that created juice to run the first type electronic pulsators. I saw a guy one time that something in his system went bad so he jigger rigged it by hooking up a battery charger to the system to run the pulsators. Not a good idea. This same guy had a water line break to the cups one time and it was to much work to fix it, so he just hooked up a garden hose with a float to the recesses manger. Put the cows feed out in front of the manger where they couldn't reach it while laying down in the stanchion. They quit using the silos because they were just to much work, so all the cows ate for forage was those goofy AC roto bales.
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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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