This procedure was originated by the inmortal Leonardo DaVinci. The result was a predictable perfectly spherical form.
Best
M
[QUOTE=M ELEY]
Still another possibility is that this is a cannon ball made using the 'shot tower' method. I've included two sites explaining this innovative method of making cannon shot, and although one confesses that the balls produced were perfectly round, I beg to differ. .
www.waymarking.com/waymarks/WM5CD3_Fort_Hayes_Shot_Tower_Columbus_OH
/QUOTE]