firewood cutting
I cut and sell firewood and I use a Bow Bar. I bought mine while I was in Virginia in 1976. The Bow is designed to be used while standing up and is used by pulp wood cutters. Most people have never seen or heard of one, to see what I am talking about go to Bailey's and find a bow bar. Their's are for the Husky.
It has a "foot" at the bottom of the bow that holds the log in place as the chain pulls against it. The bar is sort of an elipical circle and once you learn the feel of it, you can cut through the log without hitting the dirt. I have used it long enough that I cut through the wood and without cutting through the bark on the dirt side.
One big advantage is that since the bar is circluar, the part of the bar that the chain travels on is only about 1 1/2 inches, that allows the bar to keep cutting even if the log above it pinches together.
I'm sure this sounds wierd, but once you see a picture of the bow bar, it will make sense to you. They are expensive, around $119 and they are probably more dangereous to use. The bar I have will only cut a 13 inch diameter log with one cut, the new ones will cut a 14 inch log. The 13 inch bar takes an 81 link chain, so it takes a saw that will handle a 24 inch conventional bar.
One thing I've added this year is to replace one of the bolts that hold the foot to the bar with one that is an 1 1/2 longer. I put a 1/4 plastic pipe over the bolt and cut it off at 16". That way I can make uniform length firewood which customers seem to perfer.
Jerry