Training Manual in Topography, Map Reading and Reconnaissance (Classic Reprint)

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Excerpt from Training Manual in Topography, Map Reading and ReconnaissanceNote 3 - Our Field Service Regulations provide that the contour interval should be 10 feet for a military sketch made on a scale of 6 inches to the mile, 20 feet for. A sketch on a scale of 3 inches to the mile, , and, in general, the proper contour interval for any scale isto be found by dividing 60 by the number of inches on the scale which represents a mile on the ground. This system of scales is known as the United States Army Normal System. The British Army have a similar system, using 50 as the base instead of 60. In small-scale mapping these systems are usually not adhe to. The United States Geological Survey use an interval of 20 feet for their (about an inch to the mile) sheets, reducing this to 10 or even 5 feet in very ¿at country and increasing it for mountainous country.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.