I need to cut various types of bone for its marrow (ie, leg of lamb, or pork bone). I'm wondering what type of tool would accomplish this safely. I've considered bolt cutters, saws, large cleavers, but I'm still not sure. The bone will be stripped of meat, and will mostly be round leg bones about an inch in diameter, and half a centimeter of thickness of bone at most. For example, in this photo : http://perfecthealthdiet.com/wp/wp-content/uploads/2011/10/bb-3.jpg
Well, if you don't want to spend a fortune on a Commercial Butcher Shop Band Saw, your best bet is a bone saw.
Image from Philly.com
Here's one on Amazon.
Here's a less expensive one from Cabela's.
Here's a fairly reasonably priced Band Saw with Grinder. If I was going to do a lot of butchery, I'd consider that.