The perception and application of flashing lights : papers presented at an International symposium, held at Imperial College, London, 19-22 April 1971.

The flashing light has become so much a feature of our lives that an appraisal of its merits has grown into a matter for international consideration and agreement. Therefore conference was held at London, from which some papers have a separate entry. The articles have separate numbers, see A 8934 – A 8951.