Mounted to the top of the wind-box was a row of what had at first appeared to be organ-pipes. Each was several inches in diameter and a yard long. They were arranged in a segment of an arc whose center was a dense complex of rods and levers atop the console, and whose radius was a couple of yards. The pipes were joined to the console by brass levers that fanned out from the center like rays of the sun. Some of these, but not others, suddenly went into motion.