Observations at secular-variation stations in Mexico during April and May, 1937

During April and May 1937, R. O. Sandoval of the Magnetic Section of the National Astronomical Observatory of Mexico made observations of the absolute values of the magnetic elements at Oaxaca and Puebla. The results of these observations are shown in Table 1. Mr. Sandoval's instrument was CIW-type magnetometer-inductor No. 107 manufactured by the Precise Instrument Company, and the values shown in the Table are corrected to International Magnetic Standards. At Oaxaca the station is at the airport 2.5 km from the Cathedral, ISO meters northwest of the north end of the hangar and four meters east of road to farm. It is marked by a wooden peg. True azimuths from south through west are: Cross, Merced Church, 34° 11′.2; cross Santo Domingo Church, 52° 18′3.