Re: GPS make lighthouses redundant


[ Follow Ups ] [ Post Followup ] [ Previous # Next ] [ Start New Thread ] [ TarBoard ]

Posted by John Lambert on February 01, 2010 at 00:08:01 user John.

In Reply to: Re: GPS make lighthouses redundant posted by Robert Hill on January 31, 2010 at 15:12:32:

My bride and I spent our honeymoon on an island near Vancouver. One day we rowed out to the nearby lighthouse. The lighthouse keeper took us up the winding stairs to the light and reflecting lenses. I was greatly surprised to find the light was supplied by a single 60-watt light bulb, It was magnified by a succession of Fresnel lenses which gave it the candle-power to be visible 20 miles away.


Follow Ups:



Post a Followup

Name:
Eel-Mail:

Existing subject (please edit appropriately) :

or is it time to start a New Thread?

Comments:

Optional Link URL:
Link Title:
Optional Image URL:

post direct to TarBoard test post first

Before posting it is necessary to be a registered user.


[ Follow Ups ] [ Post Followup ] [ TarBoard ]