What is these angled pieces of wood at the bottom of my chimney?

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FromHollywood

Member
Oct 13, 2009
39
Pacific Northwest
I have a 1920's Craftsman home in Washington. I've always wondered what these angled boards are in the basement at the very bottom of my chimney where it meets the foundation wall. I assume they are original to the building of the house and chimney. The boards are not connected in any way to those utility lines you see in-front of the boards which came decades later. Thanks for any ideas you might have.

IMG_20231009_171120a.jpg
 
That's the form boards for the hearth. They were supposed to be removed once the concrete sets up.