My dad had one of those spark plug air pumps. Kind of crude by todays standards, but it worked. We aired up a bunch of tires with it. Not too many farmers owned portable air compressors back in the 40s and 50s, and when the Farmall H was introduced in 1939, there were a lot of farms that didn't even have electricity yet, so that spark plug air pump was a very handy tool to have around.
And yes, the engine did run while it was being used, but it ran on only 3 cylinders because the air pump was occupying the hole for plug #4.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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