Allmanna Svenska Elektriska Aktiebolaget

Magnus Bylander

Bernt Ling

For determining oblique visibility, for example on an airport, a light emitter emits a light beam and is coupled with a light receiver. A plurality of devices are located at different, known distances from the light receiver, which launch measuring bodies substantially vertically with a predetermined height for each of the units. The measuring bodies are arranged to reflect the light emitted from the light emitter back to the light receiver where the visibility is sufficient. The devices are operated sequentially.

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Vasteras, Sweden

Magnus Bylander