14 L. A. Bauer— G rarity Determinations at Sea. 



Table II. — Some Large Gravity Disturbances Shown by Hecker's Observations, 

 1901-1909.— (Revised figures 1910.) 



Cruise 



Ye'i 



*g 



Lat. 



Long. 



Depth 



m 



3600 



40 



5600 



Region 



Hamburg — ) 

 Rio de Janeiro ) 



1901 



cm 

 + 0-172 

 + -148 

 - -095 



35 



8 

 11 



02' N 

 36 S 

 44 N 



11° 56' 

 34 53 

 26 59 



W 



\Y 

 \V 



Deep sea. 



Near Pernambuco. 



Deep sea. 



r 





— 



•123 



11 



35 S 



36 49 



w 



3200 



Deep sea ) About 100 km. or 



Rio de Janeiro — J 

 Lisbon j 



1901 



+ 



•123 



6 



23 S 



33 20 



w 



5000 



" [• more from Bra- 



+ 



•142 



2 



15 N 



29 33 



w 



2000 



" ) zilian coast. 



L 





+ 



■123 



1 



04 N 



30 08 



w 



2400 



Near St. Paul. 



r 





+ 



•289 



4:; 



34 N 



9 30 



E 



200 



Med. Sea, N. of Corsica. 







+ 



•235 12 



34 N 



55 45 



E 



3400 



Near Socotra. 







+ 



•21435 



49 N 



129 54 



E 



5400 



Steep gradient. 







+ 



■346 33 



49 S 



151 54 



E 



200 



" 



Bremerhaven — J 

 Melbourne j 



1904 



+ 

 + 

 + 



•393134 



•264 28 

 ■16127 



17 S 

 20 S 

 15 S 



172 07 



178 27? 

 177 40? 



E 

 E 

 E 



150 

 2700 

 2700 



Near N. point N. Zealand. 

 Tonga Plateau. 



1 





— 



•196 23 



12 S174 47 



E 



8000 



Tonga Deep. 







— 



•273 



22 



07 S 174 13 



E 



6500 



a 







— 



•245 



17 



09 S171 42 



E 



8500 



a 



I 





+ 



•268 



■21 



17 N 



157 50 



E 



20 



Roadstead of Honolulu. 



San Francisco — I 

 Yokohama ( 



1904 



+ 



•310 



•21 



18 N 



157 37 



E 



■ 70 



Near Oahu. 



+ 



•304 



21 



17 N 



158 17 



E 



1700 



1 1 



Black Sea j 



1909 



+ 



•079 

 •052 



44 

 43 



51 N 

 36 N 



32 46 

 35 50 



E 



E 



150 

 2200 



Shallow water. 

 Deep water. 



Table III gives a comparison between Hecker's 1908 and 

 1910 values of A<7 for certain characteristic points in the Pacific 

 Ocean selected by Prof. J. F. Hayford in his paper before the 

 meeting of the International Geodetic Association of 1909.* 

 The last two columns are the differences between Hecker's 

 values of g and those computed by Hayford with the aid of his 

 new method ; I have myself added the 1910 figures. 



Table III. — Comparison op some Ocean Gravity Anomalies Observed by Hecker in 

 the Pacific Ocean with those Resulting from Hayford's Computations. 



6 



Name of Station 



Depth 



in 

 meters 



Lat. 



Long. 



Hecker's Ag 



Hecker- 

 Hayford 



'A 



1908 



1910 



1908 



1910 



1 



2 

 3 

 4 

 5 

 6 

 7 



Between Honolulu and San 



Francisco, at sea 



Tonga Plateau, at sea 



Tonga Plateau, at sea 



Tonga Deep, at sea 



Tonga Deep, at sea 



Near Hawaiian Islands, at sea 

 Near Oahu, at sea . 



5100 

 2700 

 2700 

 6500 

 8500 

 4000 

 1700 



28° 10' N 

 28 20 S 

 27 15 S 

 22 07 S 

 17 09 S 

 22 50 N 

 21 17 N 



146° 35' W 

 178 27 W 

 177 40 W 

 174 13 W 

 171 42 W 

 160 23 W 

 158 17 W 



cm 



-o-ooi 



+ -215 

 + -135 



- -271 



- -248 

 + -034 

 + -273 



cm 



-o-oio 



+ -264 

 + -161 



- -273 



- -245 

 + -062 

 + -304 



cm 

 + 0.003 

 + -207 

 + -124 



- -181 



- -162 

 + -023 

 + -203 



cm 

 -0-006 

 + -256 

 + -150 

 -'•183 

 - -159 

 + -051 

 + -234 





Mean with regard to sign 



Mean without regard to sign 









+ 0-020 

 0-168 



+ 0-038 

 0-188 



+ 0-031 

 0129 



+ 049 

 0-148 



* Hayford, J. F. The Effect of Topography and Isostatic Compensation 

 upon the Intensity of Gravity. Cf. Report of the Int. Geod. Association for 

 1909, published in 1910, pp. 365-389. 



