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Using an Abney Level to Measure Relative Heights 1) Introduction An Abney level is a small surveying instrument that consists of a sighting tube and a spirit level linked to a protractor and this allows angles and slopes
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Document Date: 2015-12-06 12:07:34
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Using an Abney Level to Measure Relative Heights 1) Introduction An Abney level is a small surveying instrument that consists of a sighting tube and a spirit level linked to a protractor and this allows angles and slopes