310 



Land Magnetic Observations, 1914-20 



NORTH AMERICA. 



United States continued. 



Cheltenham, Maryland, 1915, 1917 continued. 



Inclination observations were also made at station, 

 designated {El)', on a non-magnetic framework at- 

 tached to pier in east wing of absolute observatory 

 upon which observatory inductor is permanently 

 mounted. 



Corona, Colorado, 1918. On mountain side east of railroad 

 station, about 350 yards (320 meters) southeast of 

 east door of train-shed near entrance to lunch room, 

 42 feet (12.8 meters) south of center of leveled area 

 near shelter for meteorological instruments, south of 

 path leading to pole on summit of mountain, some- 

 what less than halfway up mountainside from railroad 

 station; marked by a cross chiseled in a stone firmly 

 imbedded in ground. True bearings: middle of top 

 of ventilator of snow-shed, three-quarters mile, 30 

 21'.8; southeast edge of hotel, half mile, 133 19'.2; 

 highest point of highest gable of hotel, half mile, 

 134 33M. 



Cove Point Lighthouse, Maryland, 1919. On level low 

 sand area south of lighthouse, approximately in a line 

 joining top of Cove Point Lighthouse with Cedar 

 Point Lighthouse, 166 paces south of steel tower near 

 lighthouse, 72 paces to high-water mark on east and 

 49 paces to high-water mark on south, 32 paces 

 southwest of small cedar tree, and 81 paces south- 

 southeast of a small lagoon. True bearings: outside 

 corner of piling at Cove Point steamer landing, 42 

 57'. 5; spire on Cove Point Lighthouse, 172 22'.0; 

 south end of timber on Barren Island, 304 56'.2; 

 Hooper Island Lighthouse, 337 17'.8; Cedar Point 

 Lighthouse, 352 43'.4. 



Cow Mountain, Colorado, 1918. About the 10,500-foot 

 (3,200-meter) level on northern slope, about 100 feet 

 (30 meters) west of an abandoned mine-shaft. True 

 bearings: summit of Rhyohte Mountain, 107 43'. 0; 

 triangulation signal on Trachyte Mountain, 127 

 04'.2; garage on Pikes Peak, 205 16'.9. 



Derring Harbor, Shelter Island, New York, 1914. The 

 station of 1910 and 1913 was reoceupied, over north 

 stone of a true meridian line, on bluff at southeast end 

 of Derring Harbor, in a wooded tract belonging to 

 Prof. Charles Lane Poor, of Columbia University, 15 

 meters from edge of bluff, 57.6 meters from south 

 meridian stone, 4.65 meters south of an oak tree, 

 7.58 meters east of a chestnut tree, 5.45 meters north 

 of an oak tree, 10.05 meters west of an ash tree, 

 measurements in each case being to copper nails 

 driven in trunks of trees. The meridian stone which 

 marks station is of granite, 6 by 6 inches (15 by 15 

 cm.) on top and about 4 feet (1 meter) long, lettered 

 on top "C. I. W. 1910" and has half-inch hole about 2 

 inches deep at center to mark precise point. Truo 

 bearings: tip of tower of iJnion Chapel, Shelter Island 

 Heights, 94 41M; middle of top of tall chimney, 

 Greenport Water Works, 130 23'.5; flagstaff at Green- 

 port schoolhouse, 144 18'.0; middle of top of tall 

 chimney, Greenport Hygeia Ice Co., 151 18'.6; spire 

 of First Baptist Church, 154 15'.3. 



Dutch Harbor, Alaska, 1915. On Amaknak Island, on 

 medium high ground north of village of Dutch Harbor, 

 north of Unalaska and U. S. Navy wireless stations, 

 about 300 yards (274 meters) northwest of pier ex- 

 tending eastward into harbor at about middle of 

 village, in line with wireless station and large white 

 house in Unalaska known as "Jesse Lee Home," and 

 in line with edge of bay near pier and a grass-covered 

 water-tank on knoll; station .4 is marked by 10-inch 

 l projecting about 1 foot (30 cm.) and having on 

 its top a circular brass plate inscribed C.I.W.1915 



NORTH AMERICA. 



United States continued. 



Dutch Harbor, Alaska, 1915 continued. 



with a small drill-hole to mark exact spot. True 

 bearings: peak east of Captains Bay, 12 44'.5; upper 

 knob of volcano slope, 131 15'.5; beacon on spit, 

 252 50'.4; pole on C. & G. S. station near water-tank, 

 328 54'.2; center gable of Jesse Lee Home, 344 24'.4. 



Station B is 34.2 meters north of A in line from 

 center gable of Jesse Lee Home extended through 

 station A. True bearings: upper knob of volcano 

 slope, 131 10'.4; beacon on spit, 254 04'.7; pole over 

 C. & G. S. station, 329 47'.4; center gable of Jesse 

 Lee Home, 344 24'.4; west gable of Jesse Lee Home, 

 344 45'.0. 



The C. & G. S. station of 1913 was reoceupied. On 

 Amaknak Island southeast of village near crown of 

 hill, about 164 feet (50 meters) south of sod-covered 

 water-tank, 98 feet (30 meters) south of observatory 

 azimuth mark; marked by square dressed stone with 

 a drill-hole in top. True bearings: point on mountain, 

 76 44'.0; observatory azimuth mark, 1S0 00'.3; 

 white post near end of island, 341 17'.8. 



Fishers Island, Connecticut, 1917. On Fort F. G. Wright 

 Military Reservation, on crest of first steep rise of 

 land north of gravel spit forming entrance to Silver 

 Eel Pond, the landing place for vessels, 35 feet (10.7 

 meters) above high-water mark, 20 feet (6.1 meters) 

 from edge of bluff, and 9 feet (2.7 meters) southeast 

 of large boulder, 4 by 6 feet (1.2 by 1.8 meters), 

 projecting 2 feet (0.0 meter) out of ground. True 

 bearings: Race Rock Lighthouse, 38 54'.6; New 

 London Harbor Lighthouse, 142 26'.2: Fishers Island 

 Fort flagstaff, 341 13'.0. 



Gillett, Colorado, 1918. On vacant lot southeast of old 

 hotel, about 50 yards (46 meters) south of center of 

 street running south, about 30 yards (27 meters) from 

 edge of stream, near foundation of house which has 

 been removed, about 150 paces east of switch-stand 

 on railway. True bearings: top of tank at Altman 

 mine, 4 miles (6 km.), 15 49'.9; tip on railway water- 

 tank, 19 56'.0; switch-stand, 93 57'. 1; summit of 

 Rhyolite Mountain, 92 40'.8; northeast corner of 

 railway station, 122 11 '.7; trigonometric signal on 

 Trachyte Mountain, 304 10'.6. 



Glen Cove, Colorado, 1918. On point of moraine about on 

 level with roofs of several houses, about 300 feet (91 

 meters) northwest of Glen Cove Inn. True bearings: 

 edge of rock, 6 to 8 miles (10 to 13 km.), 216 03'.6; 

 northwest end of ridge of Glen Cove Inn, 305 54'.8; 

 northwest end of ridge of dwelling in Glen Cove 

 340 38'.3. 



Goat Island, California, 1916. Station A is a reoccupation 

 of U. S. Coast and Geodetic Survey station of 1904 

 and C. I. W. station of 1905 and 1908, on military 

 reservation, near center of small plateau on western 

 slope of hill at eastern end of island, slightly south 

 of line from top of hill to smokestack at naval training- 

 station, and 48 feet (14.6 meters) north of line of two 

 flagpoles, one on highest point of island and other on 

 southern part of lawn at officers' quarters; marked by 

 a rough stone about 6 inches (15 cm.) square with 

 a hole in top. True bearings: tip of east radiomast, 

 44 5S'.7; tip of west radiomast, 62 17'.6; right 

 edge of chimney of house No. 8, 74 02'.4; lighthouse 

 on McDowell Point, 85 56'.2; tip of lighthouse on 

 Alcatraz Island, 104 03'.4; campanelli at University 

 of California, 234 36'.7; center of gable at Western 

 Pacific ferry, 300 07'. 1. 



Station B is 64 meters west of A in line from station 

 to lighthouse on McDowell Point. True bearing: 

 top of oast radiomast, 43 47'.7; lighthouse on 



