engineering recuitment JKSSB JE Mock Test 2025 Surveying Compass Surveying and Theodolite

Which of the following statements regarding the surveyor’s compass, when compared to the prismatic compass, is INCORRECT?  

1
The magnetic needle is of edge bar type.  
2
The object vane consists of a metal vane with a vertical hair. 
3
The graduations engraved are inverted. 
4
The magnetic needle acts as an index. 
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