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. 1920 Excerpt: ...map with a given number of locations. 3. The same degree of accuracy with the location of fewer points than would otherwise be required. The net result of the proper selection of critical points is that TIME IS SAVED BY ELIMINATION OF NEEDLESS AND UNIMPORTANT POINTS, AND MORE TIME IS THEREBY MADE AVAILABLE FOR ...
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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. 1920 Excerpt: ...map with a given number of locations. 3. The same degree of accuracy with the location of fewer points than would otherwise be required. The net result of the proper selection of critical points is that TIME IS SAVED BY ELIMINATION OF NEEDLESS AND UNIMPORTANT POINTS, AND MORE TIME IS THEREBY MADE AVAILABLE FOR DETERMINING ESSENTIAL FEATURES, THAT IS, FOR INCREASING THE ACCURACY OF THE MAP. Generally speaking, a critical point is one where there is an ABRUPT CHANGE. The following are examples: Roads: A sharp turn, a fork, crossroads, end of a road. Streams: Important changes in direction, source of a stream, points at which tributaries enter, mouth of a stream. Landmarks: Important and isolated buildings and other prominent landmarks that may be of value in location and orientation. Crossings: crossings of streams, roads, and railroads. The above are some suggestions as to what are generally considered critical points. The selection of critical points for any particular map is a matter of judgment on the part of the sketcher. HCURE 31 LESSON 21 SURFACE DISTANCE AND HORIZONTAL DISTANCE INSTRUCTOR'S PREPARATION: Materials needed: blackboard and yardstick. Place on board Figure 33, the condensed table of cosines, and Example 1. LESSON SUBJECT: It must be remembered that a map represents ACTUAL HORIZONTAL RELATIONS; that is, it is the projection of the surface of the ground on the horizontal plane of the map. Thus the true horizontal distance between A and B in Figure 30 is not the distance that one would travel in going from A to B but the projection, A'B', of that distance on a horizontal plane. In triangulation, the true horizontal distances are obtained by virtue of the principle of the method. Consequently, in using this method, irregularities of the surfac...
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
