Light Magnify ·How is the light of a lighthouse magnified so that it can be seen many miles out at sea?
Hi Skycat,
Well I once was invited to St. Mary's lighthouse off Northumberland, and was shown that it revolves on a mercury ring bearing arrangement.
The bulbs, three of them, are 1kW each - not a huge lght display, but due to the wonderful circular prismatic arrays, made of stern glass, the whole thing revolved past shutters & windows, to give a distinctive 2-2-1 flash sequence out to sea.
Check the book ...Ah, as in a mariner, you could go " that is St. Marys." Or any other lighthouse. With its' code.
And know, give or take, where you are..
The basis of your Q, I suppose, and the answer to it, is that focus of the light source, heading out is concentratated, and well visible therefore out to sea.
Great big prismatic lenses.
I can't send a diagram via this system, but sort of a concentric series of () () () things.
If I ever meet a female lighthouse keeper, I shall sing :
" Iwant to marry a light-house keeper, and live down by the sea"
According to the Beatles song.
Oh, you can apparently insert coloured filters now.
So if you get a flash of red, offshore - stay away !
All the best to the folks that operate lighthouses.
My praise to them.
Cheers,
Bob the Boat
Magnify Video Podcast - 001 Salt & Light
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26.04.2012 20:37