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Work Assignments - 14071_331
MATERIALS  TESTING SECTION

Engineering Aid 2 - Intermediate Structural engineering guide book
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Figure 14-5.-A control point sheet. shown in figure 14-5. Traverse and base line sheets give the locations of traverse or base line stations, the latitude and  departure  of  each  course  or  baseline,  and  the coordinate location of each traverse or base line station. For a traverse sheet or base line sheet, the computational sheet  used  to  compute  latitudes,  departures,  and coordinates  usually  provides  a  satisfactory  abstract. Procedures for Checking Field Notes You are already familiar with field and office work and therefore realize the ever-present possibility of errors in surveying. As supervisor, you should be aware that a large part of your job is checking to ensure that errors  are  detected.  In  the  field,  as  mentioned  before, you must keep the measurement situation in hand by ensuring that the measuring methods used are those that reduce  the  possibility  of  error  to  a  minimum.  For example,  when  tape  corrections  are  called  for,  you  must ensure that correct tension is applied, that temperatures are  taken,  and  that  temperature  corrections  are  applied accurately. You   are   also   responsible   for   error-free   com- putations.   Obviously,   you   cannot   check   all computations   by   performing   all   the   calculations involved; this would be the equivalent of doing all the computing   yourself.   You   can,   however,   require computing procedures that will, if they are followed, reveal the existence of errors. For example, you can require  that  areas  be  obtained  both  by  double  meridian distance and by double parallel distance. There are, of course, numerous other computations in which the use of two methods will give results that can be checked against each other. Finally,  you  must  develop  skill  in  the  weighing  of results for the probability of error. This is a skill that cannot  be  taught;  it  comes  with  experience.  For example, after you have had a good deal of experience with contour mapping, you develop the ability to get the “feel” of the ground when you study contour lines. This often  helps  you  spot  a  misdrawn  contour  line arrangement  because  the with  real-life  probability. Survey Crew Training arrangement is inconsistent The techniques of the actual operation of surveying instruments are, for the most part, fairly easy to learn; and a crew member learns these quickly in the field. These techniques, however, are a small part of the knowledge  involved  in  the  art  and/or  science  of surveying. If a field crew member is shown only how to set up and level an instrument, how to hold a rod, and the  like,  he  is  receiving  only  a  minimal  amount  of training. 14-10







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