Automatic Lighthouse Control1907
Reduces fuel use by activating navigation lights only during darkness.
Historical person
Historical biography and chronological timeline for Nils Gustaf Dalen, based on 2 World History Database records associated with Sweden.
Reduces fuel use by activating navigation lights only during darkness.
Develops a light-sensitive valve controlling lighthouse illumination automatically.
Engineer and Inventor
This biography is assembled from World History Database records filtered by country and personal-name fields. Exact duplicate display records are removed. The database is an index rather than a complete narrative biography; formal research should verify entries against relevant primary or specialist sources.