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Adjustments of the transit are : ( a ) to make plane of plate bubbles perpendicular to vert axis of instrument ; ( b ) to make line of sight perpendicular to horiz axis ; ( c ) to make horiz axis perpendicular to vert axis of instrument ...
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 observation consists in measuring simultaneously the horiz angle from some reference line , and the altitude of sun's center . Set the vernier at 0 ° , and sight telescope along the reference line . Then unclamp the upper motion ...
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Conditions Methods in General
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