Re: [gctechspace] Needed broken old big screen TV

From: Ing. Walter H.
Sent on: Wednesday, October 24, 2012 5:31 PM
To make Obsidian you need temperatures in the range 700 °C to 1300 °C !and a Fresnel lens hints at solar ;)
How much obsidian do you want to make?
I might have some raw material to make Obsidian if you don't have any yet,
but to the best of my knowledge you'd need a damn big lens to get a piece of black mineral glass the size of a coffee spoon.

I'd go for a preheated air and
preheated LPG gas burner, (1600 °C with ease), that's fun to play with too  ;)

W

 


On[masked]:06, Paul Breuker wrote:
A long shot but you may want to tru the local recycle tip
Saw a couple at the Merrimac site on the weekend

On Wednesday, 24 October 2012, Steve Davis wrote:

Only the rear projection TVs that look like a big box have the Fresnel lens.  Not CRT TVs

 

All the best

 

Steve

 

From: [address removed] [mailto:[address removed]] On Behalf Of Matthew Sherborne
Sent: Wednesday, 24 October 2012 13:36
To: [address removed]
Subject: Re: [gctechspace] Needed broken old big screen TV

 

Hi Steve,

 

Thanks for the quick reply.

 

I need the fresnel lense. It's a big sheet of plastic behind the glass somewhere.

 

I want to use it as a big magnifying glass. Apparently if you get one big enough, you can make your own obsidian.

 

Many Thanks,

Matthew Sherborne

 

 

On Tue, Oct 23, 2012 at 10:01 PM, Steve Dalton <[address removed]> wrote:

What do you need? - my father in law has a lot of TV parts. We threw out all the CRTs a while back though.

Last time I was at Lifeline at Molendinar still have a load of CRTs... I have no idea why they still keep them or have them powered on - they would be using more power than what they are worth.

 

On Tue, Oct 23, 2012 at 9:55 PM, Matthew Sherborne <[address removed]> wrote:

Hi guys,

 

Does anyone have an old broken big-screen TV ? (CRT style, not plasma, nor LCD)

 

The bigger the better.

 

I just need some parts from it, but I'm happy to take it away for free and dump it if that helps.

 

Many Thanks,

Matthew Sherborne





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