1
What exactly had the children seen that night through the single porthole?
2
There was no electricity, but a single porthole gave ample light.
3
Two sets of narrow bunks framed a single porthole with a sink below it.
4
Black paint obscured the single porthole.
5
About 150 of the castle's 1,000 inhabitants, of which 400 were women, lived in this dungeon, the only ventilation provided by a single porthole.