Nelson Historical Society Journal, Volume 2, Issue 6, April 1973
Epilogue
Epilogue
What about the unmanned lighthouses today? Who polishes the lenses? Why doesn't the concentrated sunlight through the lenses melt small metal objects, electrical fittings, and similar things? These were questions which puzzled this writer so he enquired from the Marine Department about the matter. The answer is that the unmanned lights are fitted with a drum type of lens and this does not focus the sunlight into a magnified pin point of heat which causes the damage.