Such was the cry that startled Frank.

He glanced up at the gyroscopes.

They were moving very slowly compared to the speed at which they had been spinning.

The cause was apparent to Frank at a glance.

Holding the falling ice and snow, the metal spars were so cold that the flakes congealed around the pivots, choking them so that the ice thus formed interfered with their revolutions.

CHAPTER V.
BARNEY AND THE BEAR.

“Pomp, we are going down into the sea!”

“Golly! Marse Frank, am de machinery bruck?”

“No; but ice is forming around the gyroscopes so they can’t revolve.”

“Fo’ de Lawd’s sake, hist up Barney, den, or he drop in de sea!”