If you look at the end checking on firewood, it becomes apparent that it dries (and subsequently shrinks) faster on the ends. As for how deep, that is debatable.Kenster said:I'm surprised no one has challenged the OP's first statement that wood dries more quickly from the ends.
There is a firewood processor called "Chomper" that shears the rounds rather than cut them. They (Rainier Hydraulics Inc.) posted results of a study that shows that end sheared wood dries faster.
http://www.chomper.net/Seasoning Study.html
The table above shows conventionally sawn and split firewood processed from nine species of wood took an average of 127 plus days to reach the same dryness (moisture content) that Chomper processed wood achieved in 60 days.