Dover
Lock and Key of the Kingdom

A Dover defence gun casts a Cyclopean eye toward the invader who never arrived.
This 9.2 inch rifle guarding the island “aircraft carrier” is intended to “repel boarders.” It does not take part in cross-channel duels. From its railway mounting it fires a 380-pound shell.

Girls man a range finder 20 miles from enemy lines.
Calculating the height and range of German planes is the job of this crew of the Auxiliary Territorial Service at Dover. The Lance-Corporal and her team relay their findings to the director for calculation. All four wear battledress.