| 摘要 |
<p>APPARATUS FOR TESTING HARDNESS OF WOODEN POLES A method and apparatus for testing the hardness of wooden telephone and powerline poles to determine whether they are safe for climbing by linemen. A gaff is wedged into the side of the pole a preselected distance under hydraulic pressure. The maximum applied pressure is a measure of the hardness of the wood which correlates well with the results obtained during subjective tests by linemen. - i</p> |
