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 - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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