Canadian Forest Service Publications
Line-throwing gun and cutter for obtaining branches from tree crowns. 1973. Collis, D.G.; Harris, J.W.E. Canadian Journal of Forest Research 3(1): 149-154.
Issued by: Pacific Forestry Centre
Catalog ID: 28602
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A technique that has proved successful for collecting branches from tall trees involves shooting a nylon monofilament line over a tree and drawing up a device to clip branches. Several shoulder guns, firing various sized line-pulling missiles to different heights, were tested. A branch clipping device was maneuvered into the crown by two men, each hauling on a line. It cut or broke off a branch when one end of the line was pulled. The method eliminates destructive felling and hazardous climbing, and can reach higher than ladders or pole pruners. It can be employed in collecting insect and disease samples, scions and cones, and for marking tree tops for aerial work.