It runs on lines straight up from the stage beneath, and keeps itself steady with screws.

You'll see it go down after we've left again.

Come to the stern, we shall see better from there." By the time that they had reached the other end of the ship, the pace had rapidly diminished almost to motionlessness; and as soon as Monsignor could attend again, he perceived that there was sliding at a footpace past their starboard side the edge of the huge platform that he had seen just now half a mile away.

For a moment or two it swayed up and down; there was a slight vibration; and then he heard voices and the trampling of footsteps.
"The bridges are fixed," remarked the priest.

"They're on the lower deck, of course.