Wayne Boatwright wrote:
On Wed 07 Sep 2005 10:26:35p, Bennett Price wrote in alt.home.repair:

I;m not sure about this but I think this technique was used to get
fairly regular sized (rectangular) chunks of granite while what you want
to do is just break it up. I'd rent a jack hammer for a few hours.

Not only that, but it will not work on concrete. Granite has a grain which
cleaves along the grain when separated with the feathers. Concrete has no
grain.

Sure it will work on concrete. The drilled holes in granite, or any
other quarried stone for that matter, are drilled straight down - they
ignore the grain when drilling.

R