Other editions of book Map Reading

A Map is a weapon which is at times as valuable as a rifle. Map Reading is a necessary part of the education of every soldier.The object of reading a map is to enable the user to obtain all the information that the map' contains, such as the direction and position of roads and villages, the character of the country, the nature of topographical features, the kind of obstacles likely to be encountered, the facilities for or difficulties in the way of visibility, and in general all information likely to be useful for the purpose of moving over the country and conducting military operations therein. To obtain this information accurately and quickly demands complete familiarity with the signs and conventions used on maps, full acquaintance with the various problems that arise and constant practice in solving them.Mr. Dale's book deals with these questions in simple and clear language, and problems are approached from the practical point of view. The book deserves careful study, and should be a valuable help to those who wish to make themselves proficient map readers.The CompassThe ScaleContoursGradientsVisibilityConventional MapsRap References

This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.

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. 1921 Excerpt: ...at X, and E. and W. through point A, from its present scale of 4 inches to the mile to TfTSTTo--(Sides of squares:1.) (4) Continue the line East through C. Assuming the present V.I. to be 100 feet and the height of the centre of the triangular patch of ground to be 436 feet, interpolate contours at 25 feet V.I. in that portion of the map North of this line and West of a line N. and S. through point D. (See Map 8.) CHAPTER IV. GRADIENTS. FINDING GRADIENTS. The figure at the head of this chapter must be familiar to everyone, as the sign placed alongside railway tracks to show the rise or fall of the ground in certain distances. The right-hand arm indicates that the land between that point and the next sign rises 1 foot in every 40 feet, and that on the left it drops 1 foot in every 50 feet. This " 1 in 40" and " 1 in 50" is called the gradient of the ground, and in map-reading is usually expressed as a fraction thus: or The numerator is the "rise" or the "fall," and the denominator is the "distance" in which the ground rises or falls one foot. Fin. 46 a. If a light railway were running up the hill (Fig. 35) from A to C, you would have to plant a post at A and another at B. 89 The distances are not the same, hence the gradients will not be the same. Now the rise from A to B and the rise from B to O are technically known as V.l.'s, and the distance from A to B and that from B to C are known as the H.E.'s. So it appears that the gradient, as a fraction, may also be expressed by placing the V.I. over the H.E. and reducing until the fraction shows 1 foot over the corresponding distance in feet..,,.. Rise or Fall V.L..,. Thus the gradient is, or, (in feet). Distance H.E. N.B.--The H.E. in a gradient must always be e...

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.