The shop was empty when they entered, but a few stout raps on the counter brought a woman, pale-faced but volubly chattering, up a ladder and through a trapdoor in the shop-floor.

The lower story was a dressing room for the actors; the upper story was the stage proper, and was reached by a trapdoor from below.

When the aviator sails over the enemy he opens trapdoors of the "arrow" boxes with a simple device and lets showers of bolts fall on the men below.