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Adjustments of the transit are : ( a ) to make plane of plate bubbles perpendicular to vert axis of instrument ... Then tighten screws and proceed with second part of adjustment as follows : Sight telescope at point A ( 200 to 300 ft ...
THE LEVEL AND ITS ADJUSTMENTS Engineer's level is a telescope to which a delicate spirit - level is attached ... The telescope can be taken out of the Ys , turned end for end , and replaced , when testing bubble for adjustment .
of its tube , the line of sight is now brought to intersect target by moving cross - hair ring by its adjusting ... This peg adjustment may be applied to line of sight of the Y - level , except that in this case , after target at A has ...
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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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