Here is a descriptive graphic of Weapon 4:.
http://c28.layerv.com/photo/weapon4.jpgThe images on the right are drawings of the wounds made by the medical examine, cropped directly from his autopsy diagrams. The outlines merely indicate the area of the wounds and the circular marks/lacerations. The longer wound is partially described by the ME thus:
a dull red rectangle 4 1/4 x l inch in greatest dimension. This mark anteriorly shows a l/2 circle mark which is 3/4 inch across
and the shorter wound thus:
another rectangle, this one 2-l/2 x 3/4 inch in greatest dimension. Its superior edge is a 5/8 inch semicircle of laceration in the anterior parietal region
Since the human head is convex, it is easy to see the limitations of the ME's drawings in understanding the size of the weapon. It was definitely solid and heavy enough to fracture the skull directly below the rectangles in a solitary break, but was not heavy enough to crush the skull as a whole. It left distinct pattern breaks, yet did not obliterate the entire side of the skull, which a heavier object would do.
Also, although the ME shows distinct, 4-sided rectangular wounds, the object was far longer to allow for it to be held and swung, and it may also have extended for some distance past the circular wounds. The ME describes these circular wounds as "l/2 circle mark which is 3/4 inch across" on the longer wound, and "a 5/8 inch semicircle of laceration" on the shorter one.
It is likely the shaft of the weapon was round. Were it flat, the wound would likely have an angular impact the length of the shaft, resulting in a different wound and fracture pattern/depth. It would also be difficult to land a square-shafted weapon that uniformly flat once, much less multiple times. Also, due to the indented circular laceration cause by the weapon, it must have had a circular ridge extending outside of the shaft. However, it is also possible that circular ridge is a depression or hole in the weapon- the ME is not specific enough to tell.
Lastly, although one diagram shows the wound tapering towards one end, the shorter wound does not. Again, this could be indicative of the shape of the weapon
or the angle and force with which it hit the convex skull. The two graphics on the left describe how the shaft looks when looking directly at the circular protrusion/indentation, and the when looking at the protrusion/indentation from the side. One image has a tapered shaft, the other does not.
I hope that helps to understand the nature of the wounds and the unknown weapon that caused it.
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