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Sight the vert hair on a well - defined point , clamp both plates , and move telescope up and down . ... Then tighten screws and proceed with second part of adjustment as follows : Sight telescope at point A ( 200 to 300 ft away ) ...
THE LEVEL AND ITS ADJUSTMENTS Engineer's level is a telescope to which a delicate spirit - level is attached parallel to line of sight , so that , when bubble is in center , the line of sight is horiz . The two common types are the Y- ...
of its tube , the line of sight is now brought to intersect target by moving cross - hair ring by its adjusting screws . Example : Instrument at Sta A Instrument at Sta B Rod reading on Sta A = 4.243 Rod reading on Sta B 4.618 Rod ...
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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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