Show london will use ra rattles atles in warning i of gas raids LONDON sirens and hand rattles will be used to give warning earning 0 of f air raids in great brita britain ui boef rey lloyd parliamentary under secretary for home affairs disclosed in an address to the ladies carlton club of london the signal for an air raid action warning will be an intermittent siren blast or a continuous blast alternately rising and falling in pitch he said the raiders past signal will be a continuous blast tor for two minutes of the siren keeping at a steady pitch gas war warnings which are much more local in character will be given by hand rattles sounded by air raid wardens warden |