f all rays, and it is in space that those energy forms
exist. Arcot had merely to transfer the enormously high energy level of
the space-curvature to any form of energy he wanted, and now, with the
complete statistics on it, he was able to do that directly. No tubes, no
generators, only fields that changed the energy already there--the
immeasurable energy available!

The next period of work he started the space distortion apparatus. That
must go at the exact center of the ship. One tremendous coil, big enough
for the _Ancient Mariner_ to lie in easily! Minutes, and flying thoughts
had made it--then came thousands of the individual coils, by thinking of
one, and picturing it many times! In ranks, rows, and columns they were
piled into a great block, for power must be stored for use of this
tremendous machine, while in the artificial space when its normal power
was not available, and that power source must be tremendous.

Then the time apparatus, and after that the driving apparatus. Not the
molecular drive now, but an attraction ray focused on their own ship,
with projectors scattered about the ship that it might move effortlessly
in every direction. And provision was made for a force-drive by means of
artificial matter, planes of it pushing the ship where it was wanted.
But with the attraction-drive they would be able to land safely, without
fear of being crushed by their own weight on Thett, for all its enormous
gravity.

The control was now suspended finally, with a series of attraction
drives about it, locking it immovably in place, while smaller attraction
devices stimulated gravity for the occupants.

Then finally the main apparatus--the power plant--was installed. The
enormous coils which handled, or better, caused space to handle as they
directed, powers so great that whole suns could be blasted
instantaneously, were put in place, and the field generators that would
make and direct their rays, their ray screen if need be, and handle
their artificial matter. Everything was installed, and all but a rather
small space was occupied.

It had been six weeks of continuous work for them, for the mind of each
was aiding in this work, indirectly or directly, and it neared
completion now.

"But, we need one more thing, Arcot. That could never land on any planet
smaller than Jupiter. What is its mass?" suggested Morey.

"Don't know, I'm sure, but it is of the order of a billion tons. I know
you are right. What are we