Rand Drill Co. Steam-Driven Air Compressor With Tandem Cylinders. Quincy Mining Company.

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I’m stumped too. I looked through the catalog to see if, maybe, the engine was single-acting since, in that case, the rods would only ever have tension on them, rather than alternating compression and tension. This isn’t the case. The cylinder is double-acting, like those on a locomotive.

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