I really like the sharpness, the contrasts and the richness of the various blacks here. It looks like it is taken right out of the 1920's and I am waiting for a worker in his overalls to come turn those wheels.
One of the 28 foot 6 inch diameter wheels turned by the gas engines. In front are a series of valves and gauges used to monitor and control the flow of blast furnace gasses, boiling water, air, and the oil pressure of the engine.