Author： Munger Thornton T. Kachin Theodore
Publisher： Society of American Foresters
ISSN： 0022-1201
Source： Journal of Forestry, Vol.47, Iss.5, 1949-05, pp. : 375-377
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Abstract
Pruning above the reach of pole saws and ladders is desirable in young Douglas-fir, but climbing with the conventional single-spur climbing iron does considerable damage. To minimize this damage the authors invented a climbing iron with several short points set on a curve to fit the tree; this they are parenting for free use in the United States.
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