, who explored the Cordilleras with the Jaderin wires, with the assistance of Capt. coincided exactly with a vertical plane passing through from southern Colombia to northern Peru (July to Perrier and Dr. Rivet. the extremities of the base, and then observed a bar, November, 1899). These operations… … A Geodetic Monument in the Cordilleras. Tulcan, Ecua- Leveling the Tulcan Base. was confided to dor, and thus the geographi- in succession. The bar really consisted of two cal service of the French army. On December 9, .1900, fixed the length of the arc of the meridian at 5 deg. parallel bars, one…
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