Question
Download Solution PDFA tacheometer was set up at station P and observations were taken on a staff held at Q, the vertical circle reading being zero. The readings were 1.980 m, 1.660 m and 1.340 m. Find the distance P Q. The instrument's multiplying and additive constants were 100 and 0.5, respectively.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
The horizontal distance between the axis and the staff is
D = ks + c
Where,
k = \(f\over i\) = Multiplying constant
c = f + d = Additive constant
f = focal length of objectives
Calculation:
Given
k = 100
c = 0.5
s = 1.980 - 1.340 = 0.64
D = ks + c
D = 100 × 0.64 + 0.5
D = 64 + 0.5
D = 64.5 m
Thus the distance between P and Q is 64.5 m. Hence option (2) is correct.
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