1
The window was not of lenticular glass like those on shipboard, but was a simple flat pane.
2
The exterior plate immediately fell back upon its hinges like a port-hole, and the lenticular glass that covered the hole appeared.
3
Immediately the outer plate fell back upon its hinges like a porthole, and the lenticular glass which closed the scuttle appeared.
4
Other closely-fitting plates covered the lenticular glasses of the skylights.
5
Other plates, closely fitted, covered the lenticular glasses, and the travelers, hermetically enclosed in their metal prison, were plunged in profound darkness.