--On 13 March 2014 07:30 +0000 Dave Malham <[email protected]>
wrote:

>  It had an awful focusing effect at
> the centre until a brilliant guy in our estates department came up
> with a relatively low cost solution which was to get a large (~3-4
> metre diameter) end dish from a beer brewing vessel and suspend it,
> concave side facing down, below the centre of the ceiling, near its
> focal point, to break up the main modes. The difference was amazing.

Just like the flying saucers in the Royal Albert Hall, in fact!

Paul

-- 
Paul Hodges


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