Question about Thelin Thompson Gnome older wood stove

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New Member
Dec 5, 2019
New Plymouth, Idaho
I have been keeping an eye out for another stove to rebuild but while snooping around I found this Thelin Thompson Gnome Stove. I am not going to buy it but was wondering what the big U shaped cast iron thing is inside the stove? These pictures came from Craigslist so hope it OK to attach them. And I hope I posted this in the right location on this forum. Thanks

Thelin Thompson Nome Inside.jpg Thelin top view .jpg