. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. SHADE TREES. 169 slightest strain, and only a bolt passing through the tree, provided with a washer and nut, is suitable for such work. If stranded wire is employed it may pass around an imbedded iron bolt at the back side of the limbs. In any system of strengthening trees, whether by wires or other methods, the best mechanical principles should be em- ployed and a careful estimate made of the amount of load that must be carried; also the proper angle of attacliment, etc. The amount of strain to overcome in wiring trees i
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. SHADE TREES. 169 slightest strain, and only a bolt passing through the tree, provided with a washer and nut, is suitable for such work. If stranded wire is employed it may pass around an imbedded iron bolt at the back side of the limbs. In any system of strengthening trees, whether by wires or other methods, the best mechanical principles should be em- ployed and a careful estimate made of the amount of load that must be carried; also the proper angle of attacliment, etc. The amount of strain to overcome in wiring trees is invariably underestimated, even with an ordinary amount of swaying. During severe tempests hardly any treejs safe, a twisting air movement of great velocity acting as a severe strain. It^is always wise to have the chain or wire used far within the limit of safety. Since the limbs or branches of a tree have a tendency. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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