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Slide 81
    TEXT VERSION OF TITLE SLIDE:

    Title: Tongue and Groove:
    Type: Text and Image Slide
    Content:

    If there is danger of a tree or portion of a tree rolling on the logger, a tongue and groove can be used. To make the tongue and groove, the stem of the tree is bored in the center. Then up and down cuts are made either closer to the top or butt of the tree, so that each of them by-pass the bore cut, but do not meet. With all fiber severed, the tongue and groove will prevent the tree from rolling.

    [Image of tongue and groove: Two images of tongue and grooves cut into fallen trees, the first with the up and down cuts closer to the top of the tree and the second with the up and down cuts closer to the bottom of the tree.]