Hinks, Arthur R. (Arthur Robert), 1873-1945 · Cambridge, University press · leaf 138
2. 12 inch Y Level. xvelling. SIMPLE LAND SURVEY 97 Now if the bubble is not in the centre of its run when theaxis is thus found to be vertical, the bubble is out of adjustment.And even if the bubble is in adjustment, it does not follow thatthe telescope below is parallel to it. These errors are…
Maps · Surveying
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