g we can do with it. I can increase its rate of energy
discharge."

The Talsonian turned a fourth dial, well off to one side, and the
brilliance of the spot increased enormously. The heat was unbearable.
Almost at once he shut it off.

"That is the principle we use in making it a weapon. Watch the actual
operation."

The ball of fire shot toward an open window, out the window, and
vanished in the sky above. The Talsonian stopped the rotation of the
dials. "It is motionless now, but scarcely visible. I will now release
all the energy." He twirled the fourth dial, and instantly there was a
flash of light, and a moment later a terrific concussion.

"It is gone." He left the controls, and went over to his apparatus. He
set a heavy silver bladed switch, and placed a new tube in the
apparatus. A second switch arced a bit as he drove it home. "Your
generator is recharging the accumulators."

Stel Felso Theu took the backplate of the control cabinet off, and the
terrestrians looked at the control with interest.

"Got it, Morey?" asked Arcot after a time.

"Think so. Want to try making it up? We can do so out of spare junk
about the ship, I think. We won't need the tube if what I believe of it
is true."

Arcot turned to the Talsonian. "We wish you to accompany us to the ship.
We have apparatus there which we wish to set up."

Back to the ship they went. There Arcot, Morey and Wade worked rapidly.

It was about three-quarters of an hour later when Arcot and his friends
called the others to the laboratory. They had a maze of apparatus on the
power bench, and the shining relux conductors ran all over the ship
apparently. One huge bar ran into the power room itself, and plugged
into the huge power-coil power supply.

They were still working at it, but looked up as the others entered.
"Guess it will work," said Arcot with a grin.

There were four dials, and three huge switches. Arcot set all four
dials, and threw one of the switches. Then he started slowly turning the
fourth dial. In the center of the room a dim, shining mist a foot in
diameter began to appear. It condensed, solidified without shrinking, a
solid ball of matter a foot in diameter. It seemed black, but was a
perfectly reflective surface--and luminous!

"Then--then you had already known of this thing? Then why did you not
tell me when I tried to show it?" demanded the Talsonian.

Arcot was sending the globe, now perfectly non-luminous, about the room.