-Chris Griffen : my fast
answer - Don't !!! You need to sort thru them and pick out the best and get them in under cover ! they need to dry out .
Surface moisture will cause them to chip and flake and spall !
Deep moisture will cause them to burst apart like a hand grenade !
This not to scare you or anyone, properly stored and dried and used dry you have a very valuable find, with great trading value, lucky you !
As always I recommend going to www.rocketstoves.com to download $15.
oo Ianto Evans' Great Book '
Rocket Mass Heaters',
to any one who does not self-identify themselves as so endowed .
This
should be an interesting
thread and I will follow it with interest ! PYRO Magic - ally yours Allen L. be safe , Keep Warm !