I couldn't hold myself, sorry...

http://www.youtube.com/watch?v=3DaboZctrHfK8




On Sat, Aug 24, 2013 at 9:19 PM, graham foulkes <bespoken1@gmail.com> wrote=
:

> Hi
> Saw some oxy acetylene torch work being done at a stone quarry on granite
> slabs to give a textured finish to the stone. It was blowing, speltching,
> off grapefruit segment sized chunks of stone at a great rate. The Romans,
> or maybe Hannibal, used heat and vinegar to clear boulders and rock
> outcrops as he crossed the Alps. Percussion drills, electrically powered
> Kango hammers, I have used to break up concrete, no rotation just
> percussion, works great.
>
>
>
> On Fri, Aug 23, 2013 at 6:58 AM, RussellMc <apptechnz@gmail.com> wrote:
>
> > > > CC HCL is about 65% AFAIR
> > > Nah; HCl tops out at about 37%; that's all that will dissolve in wate=
r.
> > > BTW, the younger daughter's science project showed that 30% HCl will
> > dissolve turkey overnight, while 30% Sulphuric acid takes several days.
>  So
> > while I normally would rate Sulphuric as more dangerous (probably becau=
se
> > concentrated H2SO4 is ~98% (!)), HCl is nothing to sneeze at=85
> >
> > Conc H2SO4 - traditionally called Vitriol or Oil of Vitriol, is a VERY
> > strong dessicant and causes massive skin disfiguration essentially
> > insytantly. Its the acid traditionally used in disfiguring avcid
> > attacks.
> >
> > Commercial conc HCL is FAR milder. Just majorly painful when poured on
> > uyour face.Aske me how I know :-(.
> >
> > I've told the story here before I think so I'll give the super short
> > version.
> > When a teenager I reached up to an above window shelf in a dark
> > workshop and a bottle of HCL that was on the ledge and had had the
> > cork (made form cork) eaten by the acid. rotated down over my upturned
> > face and covered face and eyes with conc HCKL. I had not lnown the
> > acid was there (somebody else stored it) but had a fair idea of what
> > it was. Taste is super super super ... string lemon and eyes burn
> > almost maximally*. I did the blind lemon burning sprint for a front
> > outside tap - probably 10 to 20 seconds away. and after a long long
> > long period washing out my eyes et al ended up with no long term
> > obvious ill effects.
> >
> > ___________________
> >
> > * Maximal eye burning pain may be what is experienced when surfacing
> > from a swimming pool, head thrown back, so a floating patch of
> > super-waterproof glue floating on the surface covers your eye. Nasty
> > nasty stuff, 110% VOC, hard to remove (super waterproof) ... .   Took
> > many many many weeks for eye to get back to normal but, again, no
> > obvious long term effect.The fun we've had :-).
> >
> >
> >                  Russell
> >
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