Sprig
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Yup, as I understand it its sortta like this ( < ) with more angle on the lower cut x2, I use this a fair bit as it comes naturally, bit harder to do but I think safer as far as jumping the stump with less potential of rolling on the stump as it falls too imo, etc.etc.. One of the old links posted showed it well, maybe one of the OSHA sites (?), like a 70degree opening, um 20 at the top and 50degs on the lower cut, do stand to be corrected fer sure, usual back cut about 1" above the notch line, same rule of thumb for depth of notch, 1/4-1/3 in the tree.
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