What is the diamond shaped piece in the middle of the log cut?
The tools of the logging trade pictured here are a double-bladed axe, cross cut saw, (also known as a misery whip), springboard, and gunstick. The area where the men are lying is the uncut and was made by the two choppers with axes. The gunstick is the scissors like tool that would have been used to make the final depth and angle adjustments to the undercut so that the tree fell in the desired location. Once the undercut was complete, two men would use a cross-cut saw to make a backcut (on the opposite side of the tree) so that the tree would topple from the stump. Any mistakes and the tree could fall in an unintended direction possibly causing injury or death to the logging crew.