Air Raid Siren

Air Raid Siren, 1938.

MATERIALS: a tubular steel post supporting an electrically driven siren, with a brick-built equipment cabinet.

DESCRIPTION: the siren is situated within a small rectangular-plan enclosure, formed by a chain-link fence carried on concrete posts, situated adjacent to the site of a former fire station. It is mounted on a tubular steel post, approximately 10.7m high, and an electrical supply cable and a junction box is attached to the outside of the post. It has a central steel housing attached to a steel mounting base plate and it contains an electrical armature motor with a central shaft that has a steel fan at either end, enclosed by a circular case with multiple stator sound vents with flaps. The ends of the encased fan blades are attached to a rotating hooped rotor vent with multiple rectangular stator vents. A small rectangular brick-built General Post Office equipment cabinet with a concrete slab roof, and closed by a pair of timber doors, is situated at the base of the pole, housing a 3 phase (440 volts) Air Raid Siren Control Unit.

This list entry was subject to a Minor Amendment on 23 February 2022 to reformat the text to current standards