Images of the bottom of a heating furnace in a bottom-fired configuration
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What is this spherical object that can swing back and forth?
It is quite high above the ground, over two meters in fact, making it difficult to reach with hands
It appears to be a \"plug\"; such items offer ample room for modification, allowing for the installation of platforms as well as knobs for twisting operations. The one at the back should be a counterweight ball with adjustment functions.
I don’t know what this device is used for