. Canadian forest industries 1905-1906. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. ^November, 1905 THE CANADA LUMBERMAN A spring secured to the back of the panel en- gages with the button and draws the head of the screw against the eye of the rod, and so holds the pendulum against swinging, except when the button is pushed inward to take the tension of the spring off the pendulum, which is then free to swing by gravity when the in- strument is held in a vertical plane. The disk of the clinometer, shown in the figure, also. Fig. 4.—Manner of Usi
. Canadian forest industries 1905-1906. Lumbering; Forests and forestry; Forest products; Wood-pulp industry; Wood-using industries. ^November, 1905 THE CANADA LUMBERMAN A spring secured to the back of the panel en- gages with the button and draws the head of the screw against the eye of the rod, and so holds the pendulum against swinging, except when the button is pushed inward to take the tension of the spring off the pendulum, which is then free to swing by gravity when the in- strument is held in a vertical plane. The disk of the clinometer, shown in the figure, also. Fig. 4.—Manner of Using Faustmann's Height Measure. has some directions engraved upon it. The instrument is only about 3 inches square and may be easily carried in the vest pocket. To use the instrument the observer sights along its upper edge to the top of the tree and releases the pendulum by pressing the push button. When the pendulum comes to rest over the right-hand scale, the pressure on the push button is removed, permitting the spring to act to hold the pendulum until the reading can be taken. The number now opposite the index mark is the percentage of the angle formed by a line running from the observer's eye to the top of the tree and a horizontal line running from him to its trunk. This percen- tage is the ratio between the height of the tree above the level of the observer's eye and the horizontal distance from the observer to the tree. This value is multiplied by the horizon- tal distance from the observer to the tree. The result is the height of the tree above the level of the observer's eye. The observer then sights the instrument to the base of the tree, operates it as before, takes the reading from the left-hand scale, multiplies the value thus secured by the horizontal distance from him to the tree, and adds this result to the result pre- viously obtained, and thus secures the total height of the tree. These computations may be greatly simplified by taking all observations at a
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectforestsandforestry
