. Farm forestry . Woodlots. 178 FAEM FORESTRY several forms and are known by different names. A simple one is the clinometer, which when sighted at the tip of a tree from a distance of lOO feet will read directly the height of the tree. There are several methods for finding the heights of trees without instruments. One of the simplest methods is to meas- ure the length of the shadow cast by the tree and the length of the shadow cast by a lo-foot pole set perpendicularly in the ground. When the length of the shadow cast by the tree. is multiplied by the length of the pole and the product divide
. Farm forestry . Woodlots. 178 FAEM FORESTRY several forms and are known by different names. A simple one is the clinometer, which when sighted at the tip of a tree from a distance of lOO feet will read directly the height of the tree. There are several methods for finding the heights of trees without instruments. One of the simplest methods is to meas- ure the length of the shadow cast by the tree and the length of the shadow cast by a lo-foot pole set perpendicularly in the ground. When the length of the shadow cast by the tree. is multiplied by the length of the pole and the product divided by the length of the shadow cast by the pole the result will be the height of the tree. The heights of trees can be found in this way only when they stand in the open. A staff about 4 feet long, one end held to the eye and grasped at arm's length and then held vertically in front of the eye, can be used in measuring the height of trees. A posi- tion is found out from the base of the tree where the top of the tree will be seen just over the top of the pole and the base of the tree over the hand. The distance the observer is then away from the tree will be the height of the 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 Ferguson, John Arden. New York : J. Wiley & Sons
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