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MechHub_mnornjnkr on Instagram: "Optical Square Explained in 60 Seconds | Surveying Instrument This video covers the Optical Square, a simple but accurate instrument used in chain surveying to take perpendicular offsets. ✔ Definition of optical square ✔ Construction (mirrors and housing) ✔ Working principle (reflection) ✔ Field use and precautions #opticalsquare #chainsurveying #surveyinginstruments #civilengineering #engineeringsurvey #offsets #surveyingpractical #MechHub #diploma #nep #mining
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