A surveyor set his instrument up at point A in order to observe point B. The instrument was inclined at an angle of +30°23' from the horizontal in order to observe point B. From his observations, the difference between the Upper reading and the Lower reading on the rod at point B was 2.20m while the Middle reading on the rod was 1.95m. At point A, his instrument was measured to be at a height of 1.62m. The telescope used was advertised as follows: • Telescope length = 20 cm Focal length = 20 cm Stadia interval factor = 95.50 1) What is the distance between the stadia hairs on the instrument's scope? (answer in mm) 2) What is the instrument's stadia constant? (answer in m) 3) What is the HORIZONTAL DISTANCE between point A & B? (answer in m)
A surveyor set his instrument up at point A in order to observe point B. The instrument was inclined at an angle of +30°23' from the horizontal in order to observe point B. From his observations, the difference between the Upper reading and the Lower reading on the rod at point B was 2.20m while the Middle reading on the rod was 1.95m. At point A, his instrument was measured to be at a height of 1.62m. The telescope used was advertised as follows: • Telescope length = 20 cm Focal length = 20 cm Stadia interval factor = 95.50 1) What is the distance between the stadia hairs on the instrument's scope? (answer in mm) 2) What is the instrument's stadia constant? (answer in m) 3) What is the HORIZONTAL DISTANCE between point A & B? (answer in m)
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Show complete formulas and solutions. Round off to 3 decimal places for lengths.
Angles must be in degrees, minutes, and seconds (° ‘ “) and seconds should not include decimals anymore (ex. 1°1’36.52” should be 1°1’37”).
Transcribed Image Text:A surveyor set his instrument up at point A in order to observe point B. The instrument was
inclined at an angle of +30°23' from the horizontal in order to observe point B. From his
observations, the difference between the Upper reading and the Lower reading on the rod at
point B was 2.20m while the Middle reading on the rod was 1.95m. At point A, his instrument
was measured to be at a height of 1.62m.
The telescope used was advertised as follows:
Telescope length = 20 cm
Focal length = 20 cm
Stadia interval factor = 95.50
1) What is the distance between the stadia hairs on the instrument's scope? (answer in mm)
2) What is the instrument's stadia constant? (answer in m)
3) What is the HORIZONTAL DISTANCE between point A & B? (answer in m)
4) What is the VERTICAL DISTANCE between point A & B? (answer in m)
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