HomeFactopediaBrainoffsRankingsCommunityLog In
You know 0 facts

The Lighthouse Beacon Sun Valve


Play Fact Master on Inventors  (it's free)    



Gustaf Dalén
   invented   
The Lighthouse Beacon Sun Valve
In 1907 he invented the ingenious sun valve which automatically switches on lighthouse beacons when darkness falls and switches them off at dawn.






   About - Terms - Privacy Log In