The British Caving Association

I can certainly do that and its on the project pile. Polishing the ends of a piece of limestone to a reasonably smooth finish is really not that hard so I'm wondering if the brine is really necessary? When I get some time I'll do some tests - I might be more inclined to go with a graphite or alumini...

I've just been and pressed my multimeter probes on a piece of limestone from the garden. The rock was bioclastic great scar limestone and was about 50mm thick and 150x75mm across. One side was "dry" and the other side was "wet" - i.e. it's drizzling and one surface was actually d...

I suppose I am a bit shy of mailing lists really, forums seem less pushy but thanks for the details, I hadn't heard of it. I take all your points but my hunch is that dense limestone is, in its self, not all that hydraulically permeable, unlike say sandstone or chalk. Figures I've seen suggest 2x10^...

Thanks for taking the time to respond. In digging around this subject I came across this http://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=1020&context=ijs which seems to confirm that even when you know there is a cave it still at best hard to interpret. But my interest is piqued and the...

It looks like it's a bit quiet round here but I thought I'd ask a question anyway... I have a site with a few small sinks which for a variety of reasons are unlikely to be dug so I was wondering what, if any, home-brew geophysical techniques might be practical? I think the pie-in-the-sky/holy-grail ...