and checked by electricity conveyed by platinum wires fused through the glass. All that is merely a question of detail. So you see, that except for the thickness of the blind rollers, the Cavorite exterior of the sphere will consist of windows or blinds, whichever you like to call them. Well, when all these windows or blinds are shut, no light, no heat, no gravitation, no radiant energy of any sort will get at the inside of the sphere, it will fly on through space in a straight line, as you say. But open a window, imagine one of the windows open! Then at once any heavy body that chances to be in that direction will attract usTemplate:Longdash"
I sat taking it in.
"You see?" he said.
"Oh, I see."
"Practically we shall be able to tack about in space just as we wish. Get attracted by this and that."
"Oh, yes. That's clear enough. OnlyTemplate:Longdash"
"Well?"
"I don't quite see what we shall do it for! It's really only jumping off the world and back again."
"Surely! For example, one might go to the moon."