It's called a deaccelerator double cone. As combustion products is drawn into the stack, they expand thus dropping pressure thus slowing down the exhaust products where heavy ash and embers drop out of the exhaust flow. We still use this theory today to clean all types of smokes stacks.
The top of the cone re-accelerates the exhaust to create more draw on the combustion chamber. That's why they use a double cone so they didn't loose FPM(feet per minute or how fast the air moves) or CFM(cubic feet per minute or the volume of air that is moved).
A muffler on a diesel engine performs a similar function.
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Today's Featured Article - Tuning-Up Your Tractor: Secondary Ignition Wires and Distributor - by Curtis Von Fange. In our last episode we spent the entire day checking out the spark plugs. Is that efficency? Actually, it took more time to explain than it really did to do the inspection. At any rate we decided that a compression test was in order so we could verify the internal engine status. That way we wouldn't buy any tune up parts until we were sure that the engine was in reasonable mechanical condition. Our tests showed a fictional compression reading of 85, 80, 82 and 86 psi. That is well within a
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