• Home
  • Download PDF
  • Order CD-ROM
  • Order in Print
Figure  7-14.Form  for  adjusting  latitudes  and  departures. - 14071_133
Plane  Coordinates - 14071_135

Engineering Aid 2 - Intermediate Structural engineering guide book
Page Navigation
  114    115    116    117    118  119  120    121    122    123    124  
Figure  7-15.—Sample  pages  from  traverse  table. in departure. The corrections, however, are opposite in sign to the error of closure. distances of from 1 to 100 feet. For a particular traverse line, you determine the latitudes and departures by breaking down the distance, moving decimal points, and adding up results as in the following example: Traverse  Tables/Adjusting  Bearings and Distances Suppose you want to determine the latitude and departure for a traverse line 725.32 feet long, bearing N15°30'E. To get the latitude, do it as follows. In the latitude column under 15 1/2°, lookup the latitude for 70 feet. You read 67.45 feet. If the latitude for 70 feet is 67.45 feet, the latitude for 700 feet is 674.50 feet. Note this in your notes. In   computing   latitudes   and   departures,   your arithmetical calculations can be greatly expedited by the use   of   a   traverse   table,   in   which   latitudes   and departures  for  any  bearing  and  distance  can  be determined mostly by looking for them in the table. Figure 7-15 shows sample pages from a table that gives angle-of-bearing values to the nearest quarter- degree (15'). More precise tables give angular values to the nearest 01'. Next, you look up the latitude for 25 feet under the same 15 1/2° latitude column, which is 24.09 feet. The latitude for 725 feet, then, is 674.50+ 24.09= 698.59 feet. Under each of the bearing values at the head of the page, a double column gives latitudes and departures for 7-12







Western Governors University

Privacy Statement
Press Release
Contact

© Copyright Integrated Publishing, Inc.. All Rights Reserved. Design by Strategico.