It was not a heart, beating, That muted boom, that clangour Far off, not blood in the ears Drumming up any fever To impose on the evening. The noise came from the outside: A metal detonating Native, evidently, to These stilled suburbs: nobody Startled at it, though the sound Shook the ground with its pounding. It took root at my coming Till the thudding source, exposed, Confounded inept guesswork: Framed in windows of Main Street's Silver factory, immense Hammers hoisted, wheels turning, Stalled, let fall their vertical Tonnage of metal and wood; Stunned the marrow. Men in white Undershirts circled, tending Without stop those greased machines, Tending, without stop, the blunt Indefatigable fact.