Radar In Britain: How Radiolocation Revolutionized Offence And Defense Methods -- A general view of a "Light Warning" station. This is one of the first pictures to be released telling the story of Radar the radiolocational developments which British scientists had in readiness at the outbreak of war. Radar equipment used for offensive and defensive purposes. Radar "Light Warning" stations. The "Light Warning Set" was developed to meet the need for a highly mobile equipment which could be transported quickly, sometimes by mule, or even by men, to sites unapproachable by motor transport. February 20, 1946. (Photo by British Official Photograph).