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I finally Got a fire started with a magnifying glass!
Posted by: microchip13
Date: March 05, 2006 05:25PM
Very happy.

As a last attempt before I took it in, I folded up a black piece of construction paper several times, and got the glass focused. After maybe a minute or two, it burst into flame.


Thanks.



_______________________________________________________________
Security is just a word. The act of being secure is entirely different.
"...but I think that to make your dream a reality, having a dream itself is a mandatory prerequisite"
From A Book: Walking Through The Impossible

Just because it has two clutches, shifts faster, uses a torque converter or has near-infinite gear ratios, requires less driver intervention and is more efficient doesn't make it better in my opinion.
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Re: I finally Got a fire started with a magnifying glass!
Posted by: Paul F.
Date: March 05, 2006 05:34PM
What you need NOW is a great big Fresnel Lens..

Gotta start thinking BIG!





Paul F.
-----
A sword never kills anybody; it is a tool in the killer's hand. - Lucius Annaeus Seneca c. 5 BC - 65 AD
----
Good is the enemy of Excellent. Talent is not necessary for Excellence.
Persistence is necessary for Excellence. And Persistence is a Decision.

--

--

--
Eureka, CA
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Re: I finally Got a fire started with a magnifying glass!
Posted by: Carm
Date: March 05, 2006 05:37PM
What no video?

grinning smiley

Carm
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Re: I finally Got a fire started with a magnifying glass!
Posted by: microchip13
Date: March 05, 2006 05:40PM
Maybe tomorrow.



_______________________________________________________________
Security is just a word. The act of being secure is entirely different.
"...but I think that to make your dream a reality, having a dream itself is a mandatory prerequisite"
From A Book: Walking Through The Impossible

Just because it has two clutches, shifts faster, uses a torque converter or has near-infinite gear ratios, requires less driver intervention and is more efficient doesn't make it better in my opinion.
Save The Manual Transmission
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Re: I finally Got a fire started with a magnifying glass!
Posted by: lafinfil
Date: March 05, 2006 05:45PM
Don't worry - we'll tell them you were here the whole time .... they can't pin anything on you



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Re: I finally Got a fire started with a magnifying glass!
Posted by: ztirffritz
Date: March 05, 2006 06:32PM
I have a 28cm^2 Fresnel Lense that I purchased from Edmond Scientific for about $3. It is extremely dangerous. I almost melted a penny with it. I cracked concrete, melted asphalt. You have to be really careful when handling it outdoors because you can accidentally create a severe burn in senconds. I wanted to pair it with a Stirling engine to make a generator, but then I read about a guy that has already secured VC to build a generating station in CA to do the same thing.

[scientificsonline.com]



**************************************
MacResource User Map: [www.zeemaps.com]#



Edited 1 time(s). Last edit at 03/05/2006 06:35PM by ztirffritz.
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Re: I finally Got a fire started with a magnifying glass!
Posted by: blooz
Date: March 05, 2006 06:51PM
Pyro-Leader!



And we should consider every day lost on which we have not danced at least once.
—Friedrich Nietzsche
Western Massachusetts
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Re: I finally Got a fire started with a magnifying glass!
Posted by: microchip13
Date: March 05, 2006 06:55PM
What exactly is a Fresnel Lense?



_______________________________________________________________
Security is just a word. The act of being secure is entirely different.
"...but I think that to make your dream a reality, having a dream itself is a mandatory prerequisite"
From A Book: Walking Through The Impossible

Just because it has two clutches, shifts faster, uses a torque converter or has near-infinite gear ratios, requires less driver intervention and is more efficient doesn't make it better in my opinion.
Save The Manual Transmission
Options:  Reply • Quote
Re: I finally Got a fire started with a magnifying glass!
Posted by: Markintosh
Date: March 05, 2006 07:04PM
Find a broken overhead projector at your school, open it up and look just below the glass writing surface. One screw or even one snap will release a 12 x 12 fresnel lens. These work great for starting fires...as someone said above, extremely hazardous.
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Re: I finally Got a fire started with a magnifying glass!
Posted by: BigGuynRusty
Date: March 05, 2006 07:10PM
Here you go MC13.:
[science.howstuffworks.com]

BGnR
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Re: I finally Got a fire started with a magnifying glass!
Posted by: lafinfil
Date: March 05, 2006 07:12PM
microchip13 Wrote:
-------------------------------------------------------
> What exactly is a Fresnel Lense?
>


It is a lens designed to gather and concentrate light from the collected source - i.e.

overhead projector as stated
stage lights / focusing spot light
lighthouse - one of the first uses
focusing screens on camera

etc ...








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Re: I finally Got a fire started with a magnifying glass!
Posted by: ztirffritz
Date: March 05, 2006 07:37PM
There's always this too:
[www.solardeathray.com]





**************************************
MacResource User Map: [www.zeemaps.com]#
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Re: I finally Got a fire started with a magnifying glass!
Posted by: microchip13
Date: March 05, 2006 07:41PM
Hmm, I'll have to try to get my hands on one at school.



_______________________________________________________________
Security is just a word. The act of being secure is entirely different.
"...but I think that to make your dream a reality, having a dream itself is a mandatory prerequisite"
From A Book: Walking Through The Impossible

Just because it has two clutches, shifts faster, uses a torque converter or has near-infinite gear ratios, requires less driver intervention and is more efficient doesn't make it better in my opinion.
Save The Manual Transmission
Options:  Reply • Quote
Re: I finally Got a fire started with a magnifying glass!
Posted by: mikebw
Date: March 06, 2006 02:07AM
That solar death ray site is pretty funny. If I had nothing else to do I might just build one of those for myself, although on second thought I would probably end up killing some living animal by accident, so scratch that.
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