Hilton decided to study the robots first; and asked the captain to take the ship down to observation range. Sawtelle objected; and continued to object until Hilton started to order his arrest. Then he said, "I'll do it, under protest, but I want it on record that I am doing it against my best judgment."
"It's on record," Hilton said, coldly. "Everything said and done is being, and will continue to be, recorded."
The Perseus floated downward. "There's what I want most to see," Hilton said, finally. "That big strip-mining operation ... that's it ... hold it!" Then, via throat-mike, "Attention, all scientists! You all know what to do. Start doing it."
Sandra's blonde head was very close to Hilton's brown one as they both stared into Hilton's plate. "Why, they look like giant armadillos!" she exclaimed.
"More like tanks," he disagreed, "except that they've got legs, wheels and treads—and arms, cutters, diggers, probes and conveyors—and look at the way those buckets dip solid rock!"
The fantastic machine was moving very slowly along a bench or shelf that it was making for itself as it went along. Below it, to its left, dropped other benches being made by other mining machines. The machines were not using explosives. Hard though the ore was, the tools were so much harder and were driven with such tremendous power that the stuff might just have well have been slightly-clayed sand.
Every bit of loosened ore, down to the finest dust, was forced into a conveyor and thence into the armored body of the machine. There it went into a mechanism whose basic principles Hilton could not understand. From this monstrosity emerged two streams of product.
One of these, comprising ninety-nine point nine plus percent of the input, went out through another conveyor into the vast hold of a vehicle which, when full and replaced by a duplicate of itself, went careening madly cross-country to a dump.
The other product, a slow, very small stream of tiny, glistening black pellets, fell into a one-gallon container being held watchfully by a small machine, more or less like a three-wheeled motor scooter, which was moving carefully along beside the giant miner. When this can was almost full another scooter rolled up and, without losing a single pellet, took over place and function. The first scooter then covered its bucket, clamped it solidly into a recess designed for the purpose and dashed away toward the city.
