An armored hand waved a signal—voice was utterly useless—up! A valve was flipped; a huge, flat, steel foot arose; a timber slid into place, creaking and groaning as that big flat foot smashed down. Up—again! Up—a third time! Eighteen seconds—less than one-third of a minute—ten inches gained! And, while it was not easy, two men could hold the burley—in one-minute shifts. As has been intimated, this machine "pimped" for the rotary. It waited on it, ministering to its every need with a singleness of purpose impossible to any except robotic devotion. It picked the rotary's teeth, it freed its linkages, it deloused its ports, it cleared its spillways of compacted debris, it even—and this is a feat starkly unbelievable to anyone who does not know the hardness of neocarballoy and the tensile str

