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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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