PSN-L Email List Message
Subject: Re: Modified sound card and datalogging and geophones
From: BOB BARNS royb1@...........
Date: Fri, 22 Jul 2005 21:10:59 -0400
I suspect that the propellant in the hairspray is a hydrocarbon such
A propane-air mixture does not detonate; rather it burns rapidly like
gunpowder. This would provide a longer seismic pulse than the
detonation of hydrogen-oxygen or acetylene-air mixtures.
Wayne Francis wrote:
> Just as an aside, some of these contraptions sound a little like my
> son's potato cannon. Along with the spark, it used Aqua-net hairspray as
> the volatile substance (would auto starter spray work?). Pretty good
> bang to fire that potato. They used PVC, but build one out of 2 inch
> steel pipe, give it a squirt, set it off with a sparker (they were
> experimenting with piezo, ie. barbeque striker). Might work.
> Wayne Francis
> Ojai, CA
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