Allmanna Svenska Elektriska Aktiebolaget

Bernt Ling

Bjorn Widell

Magnus Bylander

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.

Arrangement for determining visibility in the glide path of an aircraft

A tubular electrode contains a feeding tube forming an annular passage between its outside and the inside of the electrode. With the electrode forming a cathode, an arc is formed between it and a carbonaceous iron bath in an enclosed hearth having a gas outlet. Iron oxide material in flowable form is fed through the inner tube to the arc while a non-oxidizing gas is fed via the passage formed between the two tubes, to the arc. The carbonaceous iron bath is made the anode and the action of the current forms an upward bulge in the metal in the arc, gravitationally freeing the bath from any slag at the arc. In this way the iron oxide material is melt reduced, the iron component being continuously added to the bath which may be continuously tapped to provide a supply of crude iron.

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Vasteras, Sweden

Bernt Ling