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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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