| Correction instrument placed in the middle of the two fixed points, marked two horizontal lines, called a, b line, move the instrument to a fixed point at one end, marked two horizontal lines, called a ', b'. If the calculated a-b ≠ a'-b ', the telescope wefts misalignment half value. Needle up and down with school adjustment screw water level, so that the tube bubble level agreement so far. Repeat this practice until equal. |
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