14 PERCY SLADEN TRUST EXPEDITION 



A large wooden peg, marked ^ on the top, and " SEALARK, 1905" on the side, 

 is driven into the sand to mark the exact spot, and is covered with sand to a depth 

 of two feet. The hole in the centre of the bench-mark is the position of observation. 



The magnetic elements observed on this spot on October 3rd, 1905, were as follows: 



X' = 0-28142 c.g.s. 



lies ales Roches. 



The Magnetic Observation Spot, which is in Latitude 5° 41' 14" S., and Longitude 

 53° 40' 34" E., is situated about 800 yards south-westward from the Settlement, and 

 ten yards in from the edge of the beach, on the inside of the track running along the 

 island at this point. 



A newly made plantation of coconut trees (1905) extends on both sides of the 

 position. 



Two coconut trees, here leaning out over the beach, have each been marked 7R 

 on the trunk, at a short distance up from the ground and the magnetic position is 

 29 ft. 7 ins. from that on the western palm, 44 ft. 5 ins. from that on the eastern. 



A log of Casuarina wood has been marked ^ on one end; and buried upright 

 in the ground to a depth of 18 ins. at the spot, the circle in the centre of the bench-mark 

 being the exact position. 



The following magnetic elements were observed at this spot on October 14th, 1905 : 



Declination. 



At 9 h. 10 m. a.m. 3° 01' 427" W. 



„ 4h. 16 m. p.m. 2° 57' 15-6" W. 



Inclination. 

 From 1 h. 44 m. to 2 h. 46 m. p.m., - 33° 34' 55". 



Horizontal Force. 

 From 10 h. 46 m. a.m. to noon X' = 0-30292 c.g.s. 



