MAP MEASURES AND SCALE INDICATORS

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Engineering Aid 3 - Beginning Structural engineering guide book
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4.16 Figure 2-26.-Flat metric scale. Metric Scale The METRIC SCALE is used in the place of the architect’s and the engineer’s scale when measurements and dimensions are in meters and centimeters. Metric scales are available in flat and triangular shapes. The flat 30-cm metric scale is shown in figure 2-26. The top scale is calibrated in millimeters and the bottom scale in half millimeters. The triangular metric scale has six fully divided scales, which are 1:20, 1:33 1/3, 1:40, 1:50, 1:80, and 1:100. When you are using scales on a drawing, do not confuse the engineer’s scale with the metric scale. They are very similar in appearance. Whenever conversions are made between the metric and English system, remember that 2.54 cm equals 1 in. Triangular Scale Clip For use with a triangular scale, a scale clip or scale guard, such as the one shown in figure 2-27, is very helpful. The clip makes it easy for you to identify what scale you are using. Large spring- type paper clips will serve the same purpose when scale clips are not available. 29.276 Figure 2-27.-Use of triangular scale clip. MAP MEASURES AND SCALE INDICATORS MAP MEASURES are precision instruments for measuring the lengths of roads, pipelines, and other irregular outlines on maps and drawings. Distances are measured by first setting the instrument to zero, then tracing the line to be measured with the small, projecting tracing wheel, like that on the map measures shown in figure 2-28. In using map measures, do not depend entirely on the indicated numerical scale. Always check it against the graphical scale on the map or drawing. Verify if, for example, 1 in. traversed 45.712X Figure 2-28.-Types of map measures. 2-21

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