Why does the smokestack of old steam-powered locomotives have that odd narrow-wide-narrow shape? Why isn’t it just straight like a pipe?
In: 487
Here’s a [diagram](https://qph.fs.quoracdn.net/main-qimg-a410cad5f3eba37ec6910885702ce123-lq)
Fig. 115 shows it the most clearly, the smoke can escape through the shallow mesh fish while the sparks/cinders fall into the conical bucket
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