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Posted
Originally posted by inspecthistoric

This was posted over at the Old House Web forums.

Can anyone identify its purpose?

Small chains passed through each tube. You could adjust the position of each chain by slipping a link vertically into each notch.

The chains controlled ? ? ?

It depends on where the picture was taken. Out here, the first chain would have controlled the feed rate of the auger on a sawdust furnace. The second chain might have controlled the damper? I have no idea why they're labeled front & back.

If it were a different area, it might have been a coal burner.

- Jim Katen, Oregon

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