I remember old 12 volt batteries, the kind with the lead bridges on top that would sometimes have a stud sticking out of the link between the 3rd & 4th cell (2 volts each) that would give you 6 volts. My dad had plenty of old construction equipment that had 2 or 4 six volt batteries wired in series to give you 12 or 24 volts and depending on where you placed your tap wire between batteries, it would give you 6, 12,or 18 volts on the 24 volt system.
We also had two 12 volt parallel-wired batteries hooked up to an aftermarket dual solenoid starter system in a Westinghouse/Le Tourneau scraper that, when you hit the starter button, disconnected the 12 volt electrical system from the scraper, re-connected the batteries in series to give you 24 volts to the starter and once it started and you released the starter button, it switched back to 12 volts and re-connected to the rest of the electrical system- whew!
If you tapped into any of the bridges between the 2 volt individual cells on the 12 V battery below, youd get ever increasing voltage, 2 volts at a time. Thats probably how he was doing it.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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