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I heard a small part of the Jeremy Vine show this afternoon, he was talking about the different ways solar radiation can be magnified and cause fire.
Some examples mentioned were bulls eye type glass panels, shaving mirrors and make up mirrors.
I wonder how many fire risk assessors among us consider this as a cause of fire and advise accordingly?
Personally I always take care where I leave my specs, always out of the sun's rays.
Did you ever use a magnifying glass to direct the sun through to newspaper? I did and the speed it caused a fire was amazing.
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Rank: Super forum user 
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A few years ago a scientist at our place was using a round flask as a vase on their desk. The suns rays coming throught the window where focussed on the screen behind there desk and burned a hole through it.
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Rank: Super forum user
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ChrisBurns wrote:I heard a small part of the Jeremy Vine show this afternoon, he was talking about the different ways solar radiation can be magnified and cause fire.
Jeremy Vine? The man who thinks H&S is over the top and just the nannying state? Discussing the risk of fire from magnified solar radiation (is that a corrrect expression?)? Well well.......................... lol. Personally I should imagine the risk is quite low - especially in this country. Sun? What sun?
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Rank: Forum user
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Magnified Solar Radiation is not to be dismissed as unlikely even given the lack of sun in the UK
I have personally come across a number of incidents where this either occurred or had the potential to cause fires.
The one which comes to mind was an exhibit of Crystal Balls. The artist had placed them in a window which was South facing.
The artist was quickly persuaded to move them when by holding a piece of paper behind one of them the paper started to char.
John
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Rank: Super forum user
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clairel wrote:ChrisBurns wrote:I heard a small part of the Jeremy Vine show this afternoon, he was talking about the different ways solar radiation can be magnified and cause fire.
Jeremy Vine? The man who thinks H&S is over the top and just the nannying state? Discussing the risk of fire from magnified solar radiation (is that a corrrect expression?)? Well well.......................... lol. Personally I should imagine the risk is quite low - especially in this country. Sun? What sun? I believe Chris meant to say "I heard a small part of The Jeremy Kyle Show this afternoon".....
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Rank: Super forum user
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lol :-)
At least someone else has a sense of humour round here!
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Rank: Super forum user
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clairel wrote:lol :-)
At least someone else has a sense of humour round here! I'll just retreat to my bunker in case Chris logs on....
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Rank: Super forum user
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The expression I heard was "concentrated solar radiation". I think this is actually the correct expression.
If you want to see this at its most effective go to the south of France. Up in the hills not far from Perpignan is a building where the whole of one side is a concave mirror. It can actually melt steel!
Ever been a boy scout? It was one of the standard ways of lighting a fire that we were taught.
Lace makers used to use the same technique, i.e. a water filled sphere, to concentrate the light from a candle so that they could see what they were doing.
So if that presenter thought he had something new, he obviously was not very well informed!
Chris
Chris
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