She crossed the living room and paused at the door, looking through the peep hole.
I ain't heard a peep out of his room since.
She crossed to it and peered through the peep hole, surprised to see Jonny's caramel features and black eyes.
On account of its transparency and its resistance to fire and sudden changes of temperature, mica has been much used for the windows of stoves and lanterns, for the peep-holes of furnaces, and the chimneys of lamps and gas-burners.
He describes some entertaining peep-show arrangements, possibly similar to Alberti's, and indicates how the dark chamber with a concave speculum can be used for observing eclipses.