No signal bell can be heard through the wind." "

"By means of signal bells, the bridge tells the engine to go slow or fast," he finally explained, as if talking to a child.

He whirled around as the signal bell rang on the electronic brain.

Wilhin twenty minutes after the two boys arrived, the signal bell rang on the electronic brain.

But a moment later, the signal bell began to ring.

All were looking upward, hoping for some glimpse of the sun, when they heard the clang of a signal bell.

The buzz had resumed, in response to another signal bell.

Twenty minutes later the signal bell rang again on the electronic brain.

They were hard at work when the signal bell suddenly rang on the electronic brain.

Sighing, he turned away and heard the signal bell announcing the arrival of his brother and their guest.