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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.

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Castle Hill
Onzy less than an hour ago.
Up and down Castle Hill. Essentially a duplicate of track 2048, but substantially shorter as I parked blocking a gate wi walk, Len: 4.8km, Climb: 398m, Area: Slieve Mish (Ireland)

Caha Mountains: Tooreennamna
Onzy an hour ago.
Route taking in Tooreenamna, an outlier to the west of the Cummeenageera circuit and a highly rated hill. walk, Len: 4.5km, Climb: 439m, Area: Tooreennamna, Caha Mountains (Ireland) Too...

Hart Walk
GSheehy 16 hours ago.
{First off, I wasn't with the lads. Just sharing the info.}What?s not to like reading about the trials and tribulation walk, Len: 115.7km, Climb: 3215m, Area: Dublin/Wicklow (Ireland) Cloghernagh,

Summit Comment
Barnahowna: Fine-weather photo
bryanmccabe 3 days ago.
Thought a fine-weather photo of Barnahowna summit was needed!

Ott Mountain to Slieve Meelmore
Aidy 4 days ago.
Started at the Ott/Blue Quarry car park on the Moyad Road, and took a route taking in six summits, going over Ott Mou... walk, Len: 10.9km, Climb: 730m, Area: Ott Mountain, Mourne Mountains (Ireland)

Summit Comment
Torc Mountain W Top: Big brother ....
hivisibility 2 days ago.
Here's a picture of Torc itself from Torc West Top. Approx 600m between the two summits.

Summit Summary
Maumtrasna North-East Top: Worth a visit!
Collaborative entry Last edit by: bryanmccabe 3 days ago.
Maumtrasna NE top, approximately 2km NE of Maumtrasna, is worth a visit in its own right. The most direct access is via the steep ridge up to nearby spot height 542. One possible starting point is...

Summit Comment
Crossderry: Summit No 2 of a fine ridge walk.
hivisibility 3 days ago.
Here is another view of Crossderry taken from Mothillín. You can see the twin peaks at the summit area. The summit proper is the one on the right. Knocknabreeda in the background.Its pretty rugged...

Glenbeigh to Galway's Bridge
GSheehy 4 days ago.
I?m putting this one up because it was a club walk and I was thinking about the other day. There aren?t too many clu walk, Len: 40.5km, Climb: 917m, Area: Glenbeigh Horseshoe (Ireland)

Summit Comment
Mothaillín: Fabulous views to the west from the summit.
hivisibility 4 days ago.
Fine view towards Broghnabinnia and Caher from Mothillín summit.

Summit Comment
Mothaillín: Summit area as seen from Crossderry.
hivisibility 4 days ago.
Mothillín summit from Crossderry.

Peak bagging in The Sperrins in autumn
peter1 5 days ago.
Again, the use of a mountain bike is highly recommended for this route, if you are a solo walker. I left my bike in a... walk, Len: 16.2km, Climb: 1048m, Area: Mullaghclogha, Sperrin Mountains (Irela

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