I have one of the globe lamps, a replica, beautifully made and I tested it
out. It works:-) I just got this little chink of light shining on the spot
I was working on. I have to say though that it gives you a new kind of
understanding and respect for the lacemakers of the day.
Sue T
Dorset UK
Dear friends,
A friend of mine has been intrigued by how the old lacemakers lamps
actually worked - you know the candle behind the glass sphere filled
with distilled water. He put this problem to a scientists friend who
replied with this formula. It's way beyond what I can remember of
maths. I just hope it appears on arachne as I see it here.
David in Ballarat, AUS
I think if you put some water in the bowl you'd get something like this:
T = \int _{(r_{1},\theta_{1})}^{(r_{2},\theta_{2})}\frac{n(r)}{
Making it a Luneburg lens...
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