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Updated: May 28, 2025
The "blowing-tub" was such a contrivance. It was built of wood, and the air-boxes were square. There were two of these, with square pistons and a walking-beam between them. A third box held the air under a weighted piston and fed it to the furnace. Some of these were still in effective use as late as 1873. They were still used long after steam came.
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