Aerial shots biplanes + primitive early warning aircraft detector in action.
Unissued / unused material - dates and location unclear or unknown.
Aerial shots biplanes in flight. Various shots RAF (Royal Air Force) airmen using strange machine with large gramophone speakers on - could be pre-radar early warning system. C/U RAF airman sitting in special deck chair that allows him to look straight up to sky through binoculars. Night shots of spotlight. Various shots airmen manning gun - early antiaircraft gun?. More shots of early warning machine in action and airman on deck chair. M/S biplane pilots in flying gear. L/S fleet of biplanes about to take off.