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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1910 Excerpt: ...and equidistant; and second, to locate them as isolated sample areas. The Forest Service uses the strip method not only to obtain estimates of the merchantable timber, but also to secure a count of the trees not yet merchantable, to make forest maps, and to gather other detailed information necessary for a practical forest working plan. Under these circumstances lines of strip surveys are usually laid off parallel and equidistant, and run across the entire tract. Suppose, for example, that a township in the Adirondacks is to be estimated. The first step is to determine the percentage of the area to be included in the valuation surveys and to make a plan for their distribution. Usually one side of the tract is chosen as a base line and the strips are laid off at right angles to it and at equal distances apart. Stations are marked along the base line to indicate the location of the strips. The crew starts at the first station, near the end of the base line, and runs a line of 10-chain strip surveys across the tract in the chosen direction. At the farther side of the tract the crew chains along the line the distance which is to separate the strips. Then a second line of strip surveys is laid off parallel to the first, and running in the opposite direction, to station No. 2 on the base line. As soon as the base line is reached the crew proceeds to the third station, when a new strip is started parallel to the other two; and so on until the whole tract has been covered. As the strip method is ordinarily used, the chaining is not done very carefully. For example, the compassman may attach the chain to his belt at the back and in walking forward mark off the distances merely by scratching the surface of the ground with the heel without marking by a pin or stake. M...
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