During the year 1950, measurement of the arc along the 101st meridian between latitudes 20° and 30°N was completed. The following geodetic stations were established on this arc during this period: Frailes, Reposa, Salto Colorado, Cerro Grande, Ojito de las Vacas, San Nicolas, Cerritos, Mesa Redonda, Camisa, and Nieves.The Wild T‐3 theodolite was used for observations with 16 circle settings in both positions of the telescope.