[TheForge] Re: fire piston

[Ron Childers]

As I said, it was 50+ years ago, but ya'll are good memory joggers- I think
maybe they used pine pitch on the end of the rod to hold the tinder. The
flash point should be close to turpentine? 


----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net] On Behalf Of xlch58 at swbell.net
Sent: Thursday, June 08, 2006 1:16 PM
To: Sponsored by ABANA
Subject: Re: [TheForge] Re: fire piston

Actually I think it depends on the fact that the grass or tinder DOESN'T 
compressmaking the clearance volume for the air even less.   
Fortuneately, early man was more empirical and dried shavings aren't 
inhibited by the operators incomplete or incorrect theories.

Charles

Demon Buddha wrote:

> nah...  if you compress air at 70*F to 1/15th its volume, the temp 
> rises to 1050*.  That should be enough to ignite tinder.  I know it 
> sounds odd, but the ideal gas law doesn't lie.
>
> Freddie Warner wrote:
>
>> You're right, Robert, the more I think of it the more I believe there 
>> has to be some kind of vapor in the cylinder. You have to be able to 
>> compress whatever ignites and fine wood shavings or dried grass won't 
>> do that. I bet they add something like some sort of vegitable oil or 
>> something that vaporizes.
>>
>>


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