Engine shed vents

[TomJ]

I’m currently adapting a Scalescenes kit to make a two road GWR engine shed. I’m a bit stuck on these smoke vent chimneys. 

 

What where they made of? Don’t look like brick to me. Presumably wouldn’t be timber. Perhaps sheet material of some sort?

 

Any tips gratefully received!!

Edited December 5, 2021 by TomJ

[mikeg]

Tom they are in fact timber frame with an asbestos lining in the ones shown in your picture, some had timber slates angled at 45 degrees up from the outside. 

I think but not sure that some were replaced with angle frames and sheet steel slats I think in the late 150’s but it might just have been on the SR sheds?

 

hope this helps regards mike