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THE COMPASS Surveyor's compass is used to determine the MAGNETIC BEARING of a line , that is , the horizontal angle between the line and a magnetic needle . The needle is balanced on a pivot in center of a circular box , the edge of ...
The difference between the first and the final determination of azimuth of AB indicates at once the total error in the angular work . As a check against large errors in azimuth readings , the magnetic bearing of each line should be read ...
by sighting on a traverse line with the lower motion ; set the horizontal vernier to read the computed bearing or ... From an underground station near the winze or raise , measure bearings and distances to the corners , and compute ...
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I only have the second volume of this work, and I love it! Found at a local Value Village, it is filled with fascinating information. Details of all aspects of mine engineering, including compressed air, ventilation, and supporting structures. Baca ulasan lengkap
Conditions Methods in General
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