It deflects the needle / ring of the compass...........
What is prismatic 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.
objective of compass surveying
affect the results of the survey.
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 prismatic 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.
advantage it helps u know the direction of your measurement in relation to magnetic bearing disadvantage it is affected by the weather
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
objective of compass surveying
affect the results of the survey.
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.
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.
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.
survey of world culture II
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
a larger the sample size will reduce the size of the confidence interval