London, Feb. 12.
Great Britain's elaborate scheme of alr raid precautions was put to. the fest during the night when Bedford, a siratogle town with important industries, was "raided" for two hours by' giant Royal Air" Force bombers.
The main purpose of the test, according to an anmiouncement by the Home Office, was to establish the minimum amount of light that would required in war conditions to enable essential trame to proceed safely.
Another aim was to observe whether restricted lighting was readily visible from the air. Electri-clans, police, firemen all ce-operated.
Street lights were replaced with coloured low-powered lamps and vehicles, were used to test the ade~ quacy of the lighting.
'An important discovery made during the air-raid test was that alreratt ying 2,000 fect could not as a rule, sce streets illuminated by dim blue lights which, however, gave suillelent ght' to enable the gramme to move safely.
"The same effect was obtained where blue dises covered emergency trample such og fire-engines, ambulances and Tt was found that in the shopping streets, however, the windows reflect ed the outline of the blue-lighted The Home Office is following up the Irivestigations for general application. "Reuter.
Text read from the printed page and cleaned; old type leaves the occasional error.