"Yes?"
"That prism is one of the Jewels of Shanga. The wise men of Caer Dhu
carved them half a million years ago. Only they knew the secret of the
substance, and the shaping of the facets. There are only three of the
jewels left."
Sparks that were more energy than light flickered on the stone walls of
the cell. Gold and orange and greenish blue. Little flames, the fire of
Shanga, to burn the heart.
Because he was afraid, Winters said, "But the radiation, the ray that
comes through the prism. Is it the same as that in Kahora?"
"Yes. The secret of the projectors was lost also with Caer Dhu.
Presumably they use cosmic rays. By substituting ordinary quartz for
the prisms, we could make the radiation weak enough for our purpose in
the Trade Cities."
"Who is 'we,' Kor Hal?"