Whats in a LOCOMOTIVE Balloon Smokestack?

Is it just a screen spark arrestor?  Ive been seeking unsuccessfully for a cutaway diagram.

verence2 years ago

From http://sparetimelabs.com/animato/animato/3003/3003ah.html

The 3003 originally had the patented "Radley/Hunter"
stack (left), containing a stationary fan-like structure that caused the
smoke gases to whirl around inside the stack. This flung the cinders
towards the outer side of a perforated, cylindrical inner part of the
stack, where the sparks were disintegrated, extinguished and collected
as ash in the lower part of the stack.