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It deflects the needle / ring of the compass...........

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Q: How local attraction affect the use of prismatic compass survey?
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Related questions

How do you use prismatic compass?

What is prismatic compass survey


What is local attraction on compass survey?

The local attraction are the error affecting device available at near by the compass while doing surveying. the local attraction is the effect of the magnetic materials on the compass and gets the incorrect bearing.


What are the advantages and disadvantages of compass survey?

advantage it helps u know the direction of your measurement in relation to magnetic bearing disadvantage it is affected by the weather


What are the advantages and disadvantages of gyro compass?

The disadvantages of using a compass for surveying is that readings are often inaccurate (accuracy dependent on size and graduations of compass, it is easily disturbed by effects of local magnetic attraction


What are the aims and objectives of compass survey?

objective of compass surveying


Question-wording bias in a survey can?

affect the results of the survey.


What is the reason for measuring the bearing of survey lines in a compass traversing at both ends?

It is to alert the surveyors to any magnetic anomaly that may affect one of the ends. The anomaly would arise because of geological features.


What is least likely to affect the validity of a public opinion poll or survey?

The use of a five-point scale to measure responses to survey questions is least likely to affect the validity of a public opinion poll or survey.


Who found the evidence of the earth's magnetic field reversal?

The US Navy while performing a careful survey of magnetic compass anomalies in the early 1950s to improve navigation. The data and the survey was originally classified.


How did photography affect the development of visual realism?

survey of world culture II


What are the four advantages of plane table survey over chain and compass survey?

1.useful in areas which are difficult to be accesed while chain survey is limited 2.less subjective to errors,in comparison to chain survey which subjected with errors such as change in chain length 3.useful in surveying a large area since it uses transverse(taking bearing from observer to an object ana vice versa is true) 4.it is accurate method for mapping,compare to chain survey


Does sample size affect survey result?

a larger the sample size will reduce the size of the confidence interval