This is a waterwheel! It turns faster when there are more drops touching it. The quote is a traditional labor song, of unknown origin. It appeared on the cover of the Constitution of the American Miners' Association in 1864: "Step by step, the longest march Can be won, can be won; Single stones will form an arch, One by one, one by one. And, by union, what we will Can be all accomplished still, Drops of water turn a mill, Singly none, singly none." <3
