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Sight the vert hair on a well - defined point , clamp both plates , and move telescope up and down . If the point does not appear to travel along vert cross - hair , loosen screws holding cross - hair ring , and by tapping lightly on ...
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- ...
The amount of the correction , a , is obviously that angle whose sine is equal to the distance between telescopes ... In the single reading of a horiz angle , or azimuth , if the backsight is taken by the main telescope , it is obvious ...
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Conditions Methods in General
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