Manual of the Principal Instruments Used in American Engineering and Surveying, Manufactured by W. And L. E. Gurley (Classic Reprint) - Rilegato

Gurley, W. And L. E.

 
9780332151427: Manual of the Principal Instruments Used in American Engineering and Surveying, Manufactured by W. And L. E. Gurley (Classic Reprint)

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Excerpt from Manual of the Principal Instruments Used in American Engineering and Surveying, Manufactured by W. And L. E. Gurley

We have usually made our needles about one twentieth of an inch broad and one third as thick, parallel from end to end, the north and south poles being distinguished from each other, by a small scollop on the north end.

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