Structural
We were called to remove a tree on a lake lot.  It
was a Maple that had been standing dead long
enough for most of the limbs to rot off.  It had
and not hit the house, or damage other large
shade trees.  
We thought there was a good chance that the
main trunk was hollow, or starting to rot, but
once we had it on the ground, the complete
trunk was not only rot free, but almost dry at
16% Moisture Content.
A quick trip was made over to the Dromgoole
house to double-check the size of some main
support beams that termites had eaten, causing
floors to collapse to the ground.  Size needed
was 10x13, which turned out to be the ideal,
maximum size to come out of this, now mostly
dry, log.  It's hard to find dry timber this size.  It
takes years for one this size to dry.
The dry Maple would have required many stops
to sharpen the chain if we used a chainsaw mill,
and lots of time to take the logs to a mill to cut,
so we came up with this method.
Normally, "juggles" are chopped off with an axe,
but not with dry Maple!  Mike and Gregory
ended up using one axe to hit the other one to
knock off the juggles.
4-1/2 hours work, and we had
the two beams the
Dromgoole house needed,
out of a tree that needed to
the ideal state of dryness.