"Sure," grinned Billy. "For a given frequency, and a given velocity of propagation, there will be only one possible wave length to suit the conditions. That, essentially means that a given distance will have a definite number of wave lengths so long as the frequency and speed of propagation is maintained. The puller-sphere we were using is propagated on a tractor beam. The characteristics of a tractor beam are that once established, the number of wave lengths between projector and object remain the same. Then the projector presents a leading signal phase, and the phase of the tractor beam moves toward the projector to bring the two waves into zero phase difference. The projector maintains the leading phase all the time, and thus draws the object. It is just like turning a nut on a threaded rod, sort of. The wave length is analogous to the distance between the threads, and the frequency is the number of threads that pass a point when the rod is moved at the velocity of propagation. "Now, suppose we consider the threaded rod as being fixed at the far end, and pulling at the projector end with sufficient power to stretch the rod. The frequency happens to be definitely fixed by the primary standard in the control rack. The distance between remains the same by the constants set up in the tripod and puller beams. The wave length-factor, striving to satisfy the demands of the tractor beam, and maintain the correct number of wave lengths as the beam pulls, will cause the wave length to lengthen. But that tends to change the frequency-velocity factors. Result, if I'm getting obscure again, return to the thread analogy. A standard ten thirty-two screw has thirty-two threads per inch. Stretch it evenly, and disregard the distortion, and you have, say twenty-four threads per inch. Our pulling against the sun resulted in a distortion of the wave length-frequency-velocity factor, and we pull ourselves into the next notch in space that fits the increased wave length-frequency-velocity argument. "So," concluded Billy, "by pushing instead of pulling, we can cram the wave length down again, and warp space in the other direction. Think?" "I'll buy it--if you can find something to push against," said Hendricks. "Shucks," grinned Billy. "Shove out your tripod a short distance, but focus them all together. Then shove against that field of focus." "Said is as good as done," said Hendricks. "Better work, too. Right now it is raining gold coins and we're wearing a pair of boxing gloves." "And while we're on the way back--I hope--we might consider this: Suppose we take two tractors and face them at one another, hold 'em apart with a trio of pressors, and let the thing go to work. That's providing that we find any use for this subspace stuff. It might--"