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acharad (November 30, 1999 at 12:00 am)
Is it possible to hot-cast concrete blocks with that ?
GREENPOWERSCIENCE (November 30, 1999 at 12:00 am)
Go to my website.
bereaman (November 30, 1999 at 12:00 am)
Where can u get these or could you make one from perspex-be great for heating water.
jeabo0adhd (November 30, 1999 at 12:00 am)
I just realized that you were very lucky the concrete had no water in it. : )I had a coffee can forge running at over a thousand degrees sitting on concrete. A part exploded. LOL
GREENPOWERSCIENCE (November 30, 1999 at 12:00 am)
Yes, it makes the beam tighter, but you really need a 6" lens as the glass gets very warm. 6" is a wider beam with 300 degree temp vs. 700 of the 4" beam. Clear glass is not really affected by the light unless there are impurities in the glass.
steviebboy69 (November 30, 1999 at 12:00 am)
wow hard to believe how hot that got.you could see it bubble.
GREENPOWERSCIENCE (November 30, 1999 at 12:00 am)
Yes, but it needs to be at least 8" or the Fresnel lens will shatter the magnifying glass. You do not really gain much other than a smaller spot.
higgrobot (November 30, 1999 at 12:00 am)
What if you put a magnifying glass, say a 4" one and focused the beam from the fresnel lens even tighter? |
