Air Raid Warnings

When Given Signal
On receipt of ACTION WARNING AIR RAID WARNING A signal of two minutes duration. (a) A continuous note, rising and falling in pitch, the time taken from rise to rise being from two to five seconds. (b) A succession of intermittent blasts of about five secods duration, with intervals of about three seconds between blasts.
On receipt of RAIDERS PASSED RAIDERS PASSED A continuous signal of two minutes duration at a steady pitch
When given Signal
When AIR RAID WARNING is heard AIR RAID WARNING Succession of short blasts on a whistle.
Whenever the existence of gas is detected Sounding of rattles

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