112 Bowie — Recent Gravity Work in the Vnitnl States. 



Number and name of station 



30 Cambridge, Massachusetts 



81 Calais, Maine 



32 Ithaca, New York 



33 Cleveland, Ohio 



34 Cincinnati, Ohio 



35 Terre Haute, Indiana .. 



36 Chicago, Illinois 



3 7 Madison, Wisconsin 



38 St. Louis, Missouri 



39 Kansas City, Missouri 



40 Ellsworth, Kansas 



41 Wallace, Kansas 



42 Colorado Springs, Colorado 



43 Pike's Peak, Colorado 



44 Denver, Colorado 



45 Gunnison, Colorado 



46 Grand Junction, Colorado 



47 Green River, Utah 



48 Pleasant Valley Junction, Utah 



49 Salt Lake City, Utah 



50 Grand. Canyon, Wyoming 



51 Norris Geyser Basin, Wyoming 



52 Lower Geyser Basin, Wyoming 



53 Seattle, Washington (Univ't'y) 



54 San Francisco, California .... 



55 Mount Hamilton, California 



56 Seattle, Wash'gton, High School 



As the mean with regard to sign of 54 of the 56 stations 

 (the two Seattle stations were rejected on account of their very 

 large anomalies) was — "008 dyne, a correction of this amount 

 was applied to the constant (978-046) of Helraert's formula. 

 For all of the 56 stations considered as a single group the 

 means for the three reductions are as follows : 



Anomaly 



Computed 



gravity at 



station 



Observed 



gravity at 



station 







9c 







S 



-0. 



980-401 



980-397 



— 



004 



980-647 



980-630 



— 



017 



980-331 



980-299 



— 



032 



980-252 



980-240 



— 



012 



980-031 



980-003 



— 



028 



980089 



980-071 



— 



018 



980-293 



980-.277 



— 



016 



980-378 



980-364 



— 



014 



980-014 



980-000 



— 



014 



980-014 



979-989 



— 



02 



979-920 



979-925 



+ 



005 



979-775 



979-754 



— 



021 



979-505 



979-489 



— 



016 



978-943 



978-953 



+ 



010 



979-633 



979-608 



— 



025 



979-330 



979-341 



+ 



on 



979-617 



979-632 



+ 



015 



979-665 



979-635 



— 



030 



979-516 



979-511 



— 



005 



979-801 



979-802 



+ 



001 



979-909 



979-898 



— 



011 



979-937 



979-949 



+ 



012 



979-941 



979-931 



— 



010 



980-834 



980-732 



— 



102 



979-996 



979964 



— 



032 



979-671 



979-659 



— 



012 



980-826 



980-724 



— 



102 



(New Method) (Bouguer) (In free air) 

 Mean with regard to sign... — -004 — -056 -000 



Mean without regard to sign -018 -066 -030 



With the two Seattle stations omitted the means are : 

 Mean with regard to sign .. . -000 — -053 +-005 



Mean without regard to sign -015 -064 -027 



It is seen that the anomalies by the new method are 

 decidedly smaller than by the two older methods of reduction. 



An analysis of the anomalies showed that there is only 

 slight, if any, connection between the size and sign of the 



