"Wire fence?"

"Yes. You dropped the hint of it yourself, two or
three years ago."

"Oh, I remember -- the time the Church tried her
strength against us the first time, and presently thought
it wise to wait for a hopefuler season. Well, how have
you arranged the fence?"

"I start twelve immensely strong wires -- naked, not
insulated -- from a big dynamo in the cave -- dynamo
with no brushes except a positive and a negative one --"