TABLE 566. 

 GRAVITY. 



425 



The following more recent gravity determinations (Potsdam System) serve to show the accuracy which may be 

 assumed for the values in Table 565, except for the three stations in the Arctic Ocean. The error in the observed gravity 

 is probably not greater than o.oio cm/ sec 2 , as the observations were made with the half -second invariable pendulum, 

 using modern methods. 



In recent years the Coast and Geodetic Survey has corrected the computed value of gravity for the effect of ma- 

 terial above sea-level, the deficiency of matter in the oceans, the deficiency of density in the material below sea-level 

 under the continents and the excess of density in the earth's crust under the ocean, in addition to the reduction for 

 elevation. Such corrections make the computed values agree more closely with those observed. See special publica- 

 tion No. 40 of the U. S. Coast and Geodetic Survey entitled, "Investigations of Gravity and Isostasy," by William 

 Bowie, 1917; also Special Publication No. 10 of same bureau entitled, "Effect of Topography and Isostatic Compen- 

 sation upon the Intensity of Gravity," by J. F. Hayford and William Bowie, 1912. 



Name. 



Latitude. 



Elevation, 

 meters. 



Gravity, cm/sec 2 



Observed. 



Reduced to 

 sea-level. 



Refer- 



Kodaikanal, India 10 14' 



Ootacamund, India n 25 



Madras, India 13 4 



Jamestown, St. Helena 15 55 



Cuttack, India 20 29 



Amraoti, India 20 56 



Sibbulpur, India 23 9 



aya, India 24 48 



Siliguri, India 26 42 



Kuhrja, India 28 14 



Galveston, Texas 29 18 



Rajpur, India 30 24 



Alexandria, La 31 19 



St. Georges, Bermuda 32 21 



McCormick, S. C 33 55 



Shamrock , Texas 35 13 



Cloudland, Tenn 36 6 



Mount Hamilton, Cal 37 20 



Kala-i-Chumb, Turkestan 38 27 



Denver, Col 39 41 



Hachinohe, Japan 40 31 



Chicago, 111 41 47 



Albany, N. Y 42 39 



Florence, Italy 43 45 



Minneapolis, Minn 44 59 



Simplon Hospice, Switzerland 46 15 



Fort Kent, Me 47 15 



Sandpoint, Idaho 48 16 



Medicine Hat, Canada 50 2 



Field, Canada 51 24 



Magleby , Denmark 54 47 



Copenhagen , Denmark 55 41 



St. Paul Island, Alaska 57 7 



Fredericksvarn , Norway 59 o 



Christiania, Norway 59 55 



Ashe Inlet, Hudson Strait 62 33 



St. Michael, Alaska 63 28 



Hatnarfjordr, Iceland 64 3 



Niantilik, Cumberland Sound 64 54 



Glaesibaer, Iceland 65 46 



Sorvagen, Norway 67 54 



Umanak, Greenland 70 40 



Danes Island , Spitzbergen 79 46 



Arctic Sea 84 12 



Arctic Sea 84 52 



Arctic Sea 85 55 



2336 



2254 



6 



10 



28 



342 



447 



no 



118 



198 



3 



1012 



24 



2 



163 



708 



1890 



1282 



1345 



1638 



21 



182 



61 



184 



256 



1998 



1 60 



637 



664 



1239 



14 



14 



10 



10 



28 



IS 



i 

 4 

 7 



10 

 19 



10 



3 

 o 

 o 

 o 



977-645 



977-735 

 978.279 

 978.712 

 978.659 

 978.609 

 978.719 

 978.884 

 978.887 

 979.082 

 979.272 

 979.002 

 979.429 

 979.806 

 979.624 

 979-577 

 979-383 

 979.660 

 979.462 

 979.609 

 980.359 

 980.278 

 980.344 

 980.491 

 980.597 

 980.202 

 980.765 

 980.680 

 980.865 

 980.745 

 981.502 

 98i.559 

 981.726 

 981.874 

 981.927 

 982.105 

 982. 192 

 982.266 

 982.273 

 982.342 

 982.622 

 982.590 

 983-078 

 983-109 

 983-174 

 983-155 



978.366 

 978.427 

 978.281 

 978.715 

 978.668 

 978.714 

 978.856 

 978.918 

 978.923 

 979-143 

 979-273 

 979.313 

 979-436 

 979.807 

 979.674 

 979-795 

 979.966 

 980.056 

 979.877 

 980.114 

 980.365 

 980.334 

 980.363 

 980.548 

 980.676 

 980.819 

 980.814 

 980.877 

 981.070 

 981.127 

 981 . 506 

 981-563 

 981.729 

 981.877 

 981-936 

 982 . no 

 982.192 

 982. 267 

 982.275 

 982.345 

 982.628 

 982.593 

 983.079 

 983.109 

 983.174 

 983.155 



References: (i) Report i6th General Conference International Geodetic Association, London and Cambridge, 

 1909. 3d Vol. by Dr. E. Borrass, 1911; (2) U. S. Coast and Geodetic Survey, Special Publ. No. 40; * (3) U. S. Coast 

 and Geodetic Survey, Report for 1897, Appendix 6.* 



* For references (2) and (3), values were derived from comparative experiments with invariable pendulums, the 

 value for Washington being taken as 980.112. For the latter, Appendix 5 of the Coast and Geodetic Survey Report 

 for 1901, and pages 25 and 244 of the 3d vol. by Dr. E. Borrass in 1911 of the Report of the i6th General Conference 

 of the Intern. Geodetic Association, London and Cambridge, 1909. As a result of the adjustment of the net of gravity 

 base stations throughout the world by the Central Bureau of the Intern. Geodetic Association, the value of the Wash- 

 ington base station was changed to 980.112. 



SMITHSONIAN TABLES. 



