166 



Land Magnetic Observations, 1905-10 



NORTH AMERICA. 



Mexico continued. 



Chihuahua, Chihuahua, 1906 conti?iued. 



Cathedral, 218 42'.1; pipe on water tank, 6 43'.1. 

 Station B is on the east side of the city, in the open 

 country back of the Porfirio Diaz Hospital, and 20 

 feet (6.1 meters) north of road; marked by a cross 

 in top of a cement pillar 12 by 6 inches (30 by 15 cm.) 

 projecting 2 feet (61 cm.) above ground. The pillar 

 is the most southeasterly of three in a row, which 

 mark some boundary line, the middle pillar being 

 distant 60 feet (18.3 meters). The following true 

 bearings were determined: cross on main tower, San 

 Francisco Cathedral, 77 56'. 7; American church 

 tower, 46 29'. 6; the Porfirio Diaz Hospital tower, 

 145 33'.5. 



Cuajimalpa, Mexico, 1907. The stations are about 10 

 miles (16 kilometers) southwest of Mexico City, in 

 the village of Cuajimalpa. Observations were made 

 at two points, designated as A and B. Station A is 

 about 15 feet (5 meters) true south 22 15'. 2 east of 

 the magnetometer pier of the magnetic observatory, 

 and 30 feet (9.1 meters) south of west from the obser- 

 vatory dip pier. Station B is the regular cement dip 

 pier of the observatory, which is 30 feet (9.1 meters) 

 southwest of the observatory magnetometer pier. 



Cuairo Cienegas, Coahuila, 1907. In the open ground about 

 100 yards (91 meters) north of Mexican International 

 Railway depot and about 63 feet (19 meters) west of 

 a large circular cement pillar. (This pillar is one 

 of four set in a rectangle.) The station is marked by 

 a wooden peg. The following true bearings were 

 determined: Cathedral tower, 184 30'. 4; east gable 

 of depot, 347 11'.4. 



Escalon, Chihuahua, 1906. About 300 feet (91 meters) 

 north of Northern Hotel and about 300 yards (274 

 meters) northeast of railway; marked by small 

 wooden peg. The flagpole on post office is in true 

 bearing 55 35'.0. 



Cuaymas, Sonora, 1906. On a small island in the harbor 

 about 3 miles (5 kilometers) east of town and as 

 nearly as could be determined is the same as that 

 occupied by the United States Coast and Geodetic 

 Survey in 1881. It is at high-water mark of spring 

 tides, east of and close to the large round promontory 

 known as Morro Ingles. To mark the point a large 

 irregularly shaped stone was embedded in the sand 

 about a foot (30 cm.); this projects about 6 inches 

 (15 cm.) above general surface of ground. The point 

 is 70.5 feet (21.5 meters) almost due north of a lone 

 tree on the island, 92 feet (28.0 meters) to shore line 

 northeast and 66 feet (20.1 meters) to shore line 

 southwest. The following true bearings were deter- 

 mined: northeast corner of tall yellow building of the 

 Consolidated Copper Company's smelter plant, 

 149 21'.0; west gable point of long building at harbor 

 entrance, 353 32'.4. 



Hermosillo, Sonora, 1906. In public park known as Parque 

 Ramon Cerral, just east of and adjoining the city; 

 in extreme eastern part and a little north of center of 

 the park in the midst of orange trees. To mark the 

 point a wood post 2J^ feet (76 cm.) long was driven 

 into the ground; this projects about 6 inches (15 cm.) 

 above the general surface of the ground. The point 

 is 13 feet (4.0 meters), 17.3 feet (5.3 meters), 27 feet 

 (8.2 meters), and 24 feet (7.3 meters) respectively 

 from orange trees to the northwest, southwest, 

 southeast, and northeast, and 46.2 feet (14.1 meters) 

 from a large stone at corner of driveway to the north- 

 cast. The Catholic Church spire is in true bearing 

 41 57'.3. 



NORTH AMERICA. 



Mexico concluded. 



Jimenez, Chihuahua, 1906. In a pasture about midway 

 between the Mexican Central Railway depot and the 

 main town, about 100 meters southeast of tramway; 

 marked by wooden peg. The northeast and higher 

 tower of cathedral is in true bearing 98 17'.3. 



Monterey, Nuevo Leon, 1907.^ Two stations, A and B, were 

 occupied. Station A is on a hill west of city and 

 southeast of ruins of an old cathedral; marked by 

 hole in top of a cement block 6 by 6 by 20 inches 

 (15 by 15 by 51 cm.) projecting slightly above ground. 

 The following true bearings were determined: Cath- 

 edral tower, 282 48'.8; Trinity Church tower, 255 

 16'. 6. Station B is 63 feet 6 inches (19.35 meters) 

 from station A, in the line to Cathedral tower; marked 

 by a wooden peg. Intercomparisons of C. I. W. and 

 Mexican instruments were made at this point. 



Nueva Casas Grandes, Chihiiahtia, 1906. Northeast of 

 depot, in the open ground belonging to the Rio 

 Grande, Sierra Madre and Pacific Railway Company, 

 and about 200 yards (183 meters) east of the railway; 

 marked by peg driven flush with ground. 



Oaxaca, Oaxaca, 1907. West of town, on west bank of 

 Oaxaca River, 15 feet (4.6 meters) north of road lead- 

 ing to San Juan Cathedral and 12 feet (3.7 meters) 

 south of an irrigation ditch; marked by wooden 

 peg. The following true bearings were determined: 

 Cathedral clock tower, 238 39'. 3; flagpole, statue of 

 Juarez, 200 04'.7; cement landmark on hill, 77 03'. 1. 



Salinas, Coahuila, 1907. In an open square in the north 

 corner of town, about 400 yards (366 meters) south- 

 west of a spur of the Mexican International Railway, 

 and about half a mile (0.8 kilometer) northwest of 

 depot; marked by a hole in top of small flat stone sunk 

 flush with the ground, and is 80 feet (24.4 meters) from 

 fence on northwest side of square. A tower is in true 

 bearing 115 13'.8. 



San Pedro, Coahuila, 1906. About half a mile (0.8 kilo- 

 meter) east of the city, in a cotton field of the " Rancho 

 Memphis," and about 200 feet (61 meters) south of 

 the ranch house; marked by wooden peg. The city 

 clock tower is in true bearing 92 52'.9. 



Santa Barbara, Chihuahua, 1906. On a hill northwest of 

 town, 9 feet (2.7 meters) southeast of cast corner of a 

 graveyard and marked by wooden peg. The following 

 true bearings were determined: Cathedral spire, 325 

 43'. 5; south gable of north smelter plant building, 

 203 32'.3. 



Sierra Mojada, Coahuila, 1906. On southwest edge of 

 town, about 300 yards (274 meters) south of depot, 

 and marked by small wooden peg. The cross on 

 Cathedral tower is in true bearing 238 49'.4. 



Temosachic, Chihuahua, 1906. On open ground southwe.st 

 of Chihuahua and Pacific Railway depot, 40 feet 

 (12.2 meters) northwest of creek and 250 Tect (76 

 meters) northeast of wire fence; marked by a wooden 

 peg driven flush with ground. 



Newfoundland. 



Battle Harbor, Labrador, 1905. Station A is in southern 

 part of Battle Harbor, about 20 feet (6 meters) south 

 of an inclosure surrounding a pond about 16 feet 

 (5 meters) in diameter. The lighthouse on Double 

 Island is in true bearing 314 40'. 1. Station B,n is on 

 Battle Island, northeast of Hospital of the Royal 

 National Mission to Deep Sea Fishermen, and about 

 midway between hospital and the base of a clift' which 

 rises nearly perpendicular along the east. Lieut. 



