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Whats in a LOCOMOTIVE Balloon Smokestack? Answered

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

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verence (author)2015-07-23

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.

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