Is that clear?"

"I'd like to see that one worked out on a blackboard," said Jimmy. "At

the present, I'll take your word for it. What I'm interested in right

now is: does this factor 'R' increase with the power setting?"

"Drake just lifted it to thirty feet per," said Hammond, "and I've been

timing it. So far, it does."

"Steve," said McBride, "if we can figure out some way of keeping

ourselves from getting killed as the acceleration hits the upper

brackets, we'll have a drive that will get us places like fury. Think

fast, brother."

Hammond looked up, just as the acceleration reached a peak, and it

snapped his head sharply. "_Whew_," he said. "This is fine stuff,

but we couldn't run anywhere very long this way. We'd shake the whole

crate loose." He was thoughtful for a minute. "Don't suppose that

blackboard mind of yours could figure out our course constants from

this saw-toothed curve we're running?"

"Sure," grinned McBride. "Since the thing is not increasing constantly,

but is returning to zero accel each time and then building up linearly

to peak, our over-all, long-time acceleration is equivalent to the

average acceleration. Besides, what difference does it make? We'll get

there somehow, and we can probably plot well enough to keep from doing

a lot of return-chasing to hit the lens."

"O.K., but we're going to have to figure a way out of this. I couldn't

stand knowing anything like this drive without trying to make it

practical."

"Wait until we can talk without getting our tongues bitten off by this

drive of yours, and we'll go to work on it."

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