Before there were mobile phones ....
... there were other ways to interrupt a concert. The photo above was taken at a 1922 Promenade Concert in the Queen's Hall, with Sir Henry Wood conducting. Below is an enlargement of the sign visible in the left of the picture.
Bach and the art of noise here.
Photo comes from the 1944 BBC book Sir Henry Wood, Fifty Years of the Proms, that featured in an earlier post. Any copyrighted material on these pages is included as "fair use", for the purpose of study, review or critical analysis only, and will be removed at the request of copyright owner(s). Report errors to - overgrownpath at hotmail dot co dot uk