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Hello Simon,My nam.. by simon3   (Show all posts)
THIS SATURDAY AUGU.. by Bleck Cra   (Show all posts)
I'm speaking at a .. by ahendroff   (Show all posts)
khkk
2011-08-22 10:53:25
Lasers in the mist
Interesting account of light scattering in mist. Readers of MV will be aware, of course, that although Lord Rayleigh first measured the phenomenon, it was ' In 1859 John Tyndall discovered that when light passes through a clear fluid holding small particles in suspension, the shorter blue wavelengths are scattered more strongly than the red (as in the demonstration above). Later John William Strutt, 3rd Baron Rayleigh, developed equations which approximately describe the behavior of light scattered by small particles and molecules, objects with dimensions much smaller than the wavelength of the radiation in question. Rayleigh's equations predict scattering in terms of the object's size relative to the light's wavelength, and the object's refractive index.'

Check out: http://sxxz.blogspot.com/2007/11/why-is-sky-blue.html
or http://tyndallmountainclub.blogspot.com/ , the site of Kilkenny's Tyndall Mountain Club, which was named to comemorate that illustrious mountaineer & scientist.
Mountain Rescue Te.. by simon3   (Show all posts)
Thought I'd post s.. by paulca   (Show all posts)
found the explanat.. by jackill   (Show all posts)
Can give no assist.. by Conor74   (Show all posts)
On the top of Stum.. by simon3   (Show all posts)
Can anyone explain.. by Dessie1   (Show all posts)


RECENT CONTRIBUTIONS 1 2 3 .. 17 Next page >>
Track
Galtymore & Galtybeg from King's Yard
conrad1179 13 hours ago.
run, Len: 11.8km, Climb: 670m, Area: Galtymore, Galty Mountains (Ireland) Galty...

  
Summit Summary
Camaderry South East Top: Steep climb, sorry trail, great views.
Collaborative entry Last edit by: simon3 a day ago.
There's a number of ways to reach the top such as starting from the main, paying, carpark near the Glendalough lake at around T1115 9635. Going straight up from here more or less north there is an...

  
Summit Comment
Kirikee Mountain: Kirikee from the NW.
simon3 a day ago.
From the ridge south of Derrybawn there is this NW view of Kirikee.Courtesy of siteviewer_comreg.ie we can find the owner of this mast: Three Ireland.The amusing conjunction with the cairn below t...

Summit Summary
Brockagh Mountain SE Top: Flattish height NW of Laragh with views, boggy paths a
Collaborative entry Last edit by: simon3 a day ago.
Situated at the south eastern tip of a spur from Tonelagee it therefore commands wonderful views out over Laragh to the south east and Glenmacnass valley and waterfall to the north. Glendalough is...

  
Summit Comment
Carrickarede: Island.
sandman 3 days ago.
Carrickarede island is connected to the mainland by the world famous Carrick-a-Rede rope bridge. One of Northern Ireland's top tourist attractions it is operated by the National Trust but unfortun...

  
Track
BRANDON HILL - THE QUICK WAY
David-Guenot 2 days ago.
A steep but quick ascent along the forestry on rocky terrain, along what I believe has been dug as a firebreak rather ... walk, Len: 5.0km, Climb: 305m, Area: Brandon Hill, South Midlands (Ireland) B

Summit Comment
Inishmeane: The concrete road thru the village
magicstep 3 days ago.
Part of the village, about 10 houses in total.

  
Summit Comment
Inishmeane: Not much to do, a tranquil place.
magicstep 3 days ago.
Visited in 2014. There's a sandy beach and a solid pier with slipway and a picnic table facing the mainland. The road from the pier all the way thru the village is a robust concrete one, but it's ...

  
Track
BLACKSTAIRS CHALLENGE 2017 - A PEAK-BAGGER'S ROUTE
David-Guenot 2 days ago.
walk, Len: 34.1km, Climb: 1629m, Area: Black Rock Mountain, Blackstairs Mountai...

Summit Comment
Inishsirrer: Deserted village
magicstep 4 days ago.
Mainland on the horizon (left and right)

  
User profile
ewen
ewen 5 days ago.
Now living furth of Scotland and getting to know the Irish hills. If you come across a Scottish hill Walker with dodgy knees and walking sedately, stop and say hello.

  
Summit Comment
Inishsirrer: The only building that is not a ruin.
magicstep 4 days ago.
Surprisingly Donegal islands have a very good mobile internet reception, sometimes better than in an office in Dublin.


RECENT CONTRIBUTIONS 1 2 3 .. 17 Next page >>