In the science-fiction movie "Quatermass 2", there is a siren at a
guardhouse, of the plant that is producing alien poison.
This siren goes off half a dozen times in the movie.
It looks like a Diaphone, but its shorter and has a real-windup.
Has anyone seen this or know what this is?
It was filmed in England (at the Shell Oil Refinery), if that helps.