[16303], Wt. 9639/33 G. A. 100. 6/18
Text: In the event of alarm by Maroon the staff of this building must go to the basement.
MU: Broadside is encapsulated.
Broadside giving instructions for to be taken following a Maroon alarm. A maroon is an exploding firework that creates a loud bang to act as a signal or warning. In the First World War, they were used in London to warn of imminent air raids. (Book Drum web site notes on Rebecca by Daphne du Maurier.)
