Here Casimir looked sheepish and shifted nervously, looking at his Neutrino friends.
"Oh," said Krupp, sounding let down, "not so fast, eh?" "Oh, no no no. Don't get me wrong. The final velocity isn't bad." At this the Neutrino members clapped their hands over their mouths and stifled shrieks and laughs. "I was just going to let you see that for yourselves instead of throwing a lot of numbers at you." "Well, that's fine!" said Krupp, sounding more sanguine. "Don't let us laymen interfere with your schedule. I'm sorry. Just go right ahead." He stepped back and crossed his arms as though planning to shut up for hours.
Casimir gave the empty bucket a tap and there were oohs and aahs as it floated smoothly and quietly down the rails, bounced off a stop at the end and floated back with no change in speed. He reinserted the one-kilogram brass cylinder. "Now let's try it. As you can see we have a momentum absorber set up at the other end of the lab."
The "momentum absorber" was ten squares of 3/8-inch plywood held parallel in a frame, spaced two inches apart to form a sandwich a couple of feet long. This was securely braced against the wall of the lab at the same level as the mass driver. had assumed that the intended target was a wastebasket floor beneath the "muzzle" of the machine, but now realized that Casimir was expecting the weight to fly about twenty feet without losing any altitude. "I suggest you all stand back in case something goes wrong," said Casimir, and feeling somewhat alarmed I stood way back and suggested that Sarah do likewise. Casimir made a last check of the circuitry, then hit a big red button.
The sound was a whizz followed by a rapid series of staccato explosions. It could be written as: ZZIKKH where the entire sound takes about a quarter of a second. None of us really saw anything. Casimir was already running toward the momentum absorber. When we got there, we saw that the first five layers of plywood had perfectly clean round holes punched through them, two more had messy holes, and the next layer had buckled, the brass cylinder wedged in place at its bottom. Casimir pulled out the payload with tongs and dropped it into an asbestos mitt he had donned. "It's pretty hot after all those collisions," he explained.
Everyone but Casimir was electrified. Even the Neutrino observers, who had seen it before, were awed, and laughed hysterically from time to time. Sarah looked as though whatever distrust she had ever had in technology had been dramatically confirmed. I stared at Casimir, realizing how smart he was. Virgil left, smiling. Krupp's little friend paced between mass driver and target, hands clasped behind back, a wide smile nestled in his silver-brown beard, while Krupp himself was astonished.
"Jesus H. Christ!" he yelled, fingering the holes. "That is the damnedest thing I've ever seen. Good lord, boy, how did you make this?"
Casimir seemed at a loss. "It's all done from Sharon's plans," he said blankly. "He did all the magnetic fieldwork. I just plugged in the arithmetic. The rest of it was machine-shop work. Nothing complicated about the machine."
"Does it have to be this powerful?" I said. "Don't get me wrong. I'm impressed as hell. Wouldn't it have been a little easier to make a slower one?"
"Well, sure, but not as useful," said Casimir. "The technical challenges only show up when you make it fast enough to be used for its practical purpose-- which is to shoot payloads of ore and minerals from the lunar surface to an orbital processing station. For a low-velocity one we could've used air cushions instead of magnetic fields to float the bucket but there's no challenge in that."
"What's the muzzle velocity?" asked Krupp's guest, who had appeared next to me. He spoke quietly and quickly in an Australian accent. When I looked down at him, I realized he was Oswald Heimlich, Chairman of the Board of Trustees of American Megaversity and one of the richest men in the city -- the founder of Heimlich Freedom Industries a huge de fense contractor. Casimir obviously didn't know who he was.
"The final velocity of the bucket is one hundred meters per second, or about two hundred twenty miles per hour." "And how could you boost that?"
"Boost it?" Casimir looked at him, startled. "Well, for more velocity you could build another just like this-- " "Yes, and put them together. I know. They're interconnectible. But how could you increase the acceleration of this device?"
"Well, that gets you into some big technical problems. You'd need expensive electronic gear with the ability to kick out huge pulses of power very quickly. Giant capacitors could do it, or a specialized power supply."
Heimlich followed all this, nodding incessantly. "Or a generator that gets its power from a controlled explosion."
Casimir smiled. "It's funny you should mention that. Some people are speculating about building small portable mass drivers with exactly that type of power supply-- a chemical explosion-- and using them to throw explosive shells and so on. That's what is called-- "