108 Bowie — Recent Gravity Work in the United States. 



of transparent celluloid templates on which the boundary lines 

 of the various zones were drawn. These templates, made to 

 proper scale, were superimposed on the contour maps. 



The following are condensed tables for zones E and K, 

 which are hollow c} 7 linders. The corrections are given in the 

 fourth decimal place in dynes. 



Zone E. Inner radius, 590 meters. Outer radius, 1280 meters. Eight compartments. 



■ Correction for elevation of station. — 



Mean 

 elevation. 

 Fathoms 



— 500 



— 400 



— 300 



— 200 



— 100 



— 50 

 Feet 







400 



. 800 



1200 



2000 



3000 



4000 



5000 



6000 



8000 



10000 



15000 



Correc- 

 tion 



— 17 

 -13 



— 9 



— 4 



— 1 



— 1 





 + 1 

 + 3 

 + 7 

 + 16 

 + 28 

 + 37 

 + 45 

 + 51 

 + 60 

 + 66 

 + 73 



Station above compartment. 

 200 600 1000 1800 3000 

 feet feet feet feet feet 



— 1 



Station below compartment. 

 200 600 1000 1800 3000 

 feet feet feet feet feet 



— 1 



— 1 



— 1 



— 1 

 





 + 1 



+ 1 



+ 2 



+ 2 



+ 2 



+ 1 



+ 1 



+ 1 















— 3 



— 3 



— 2 



— 2 



— 1 







+ 2 

 + 4 

 + 4 

 + 5 

 + 4 

 + 3 

 + 2 

 + 1 



— 1 



— 1 



— 1 



— 4 

 -4 



— 2 



— 1 



— 4 



— 3 



— 2 



■1 





 +3+4+3 

 +6+6+5 

 +7+7+4 

 +7+6+1 

 +5+2—4 

 + 3 — 1 — 9 

 + 1—4 —13 



— 6 —16 

 -2 — 9 —20 



— 3 —10 —22 



— 4 —12 —24 



-1 



-1 —5 



-2 —7 —12 



-2 —9 -16 —30 



•2 —9 —17 —35 -56 



-1 —7 —14 —32 —60 



-1 —6 —13 —29 —57 



-1 —5 —11 —26 —51 



0—4 — 9 -22 —43 



0—4 — 8 —19 —38 



0—3 — 6 —16 —32 



Zone K. Inner radius, 12400 meters. Outer radius, 18800 meters. 20 compartments. 



■Correction for elevation of station. - 



Mean 

 elevation. 

 Fathoms 



— 1200 



— 800 



— 400 

 Feet 







1000 



2000 



6000 



10000 



13000 



15000 



Station above compartment. 

 Correc- 600 1800 4200 7200 



tion 



+ 1 

 + 1 

 + 1 







— 1 



— 1 



— 2 



— 1 

 + 1 



+ 3 



feet feet feet feet 



— 1 —1 



—1 —1 



—1 —1—1 



Station below compartment. 

 600 1800 4200 7200 

 feet feet feet feet 





 

 

 + 1 

 + 1 

 + 1 

 + 1 





 



+ 1 



+ 2 

 + 2 

 + 3 

 + 3 







+ 1 

 + 1 



+ 3 

 + 6 

 + 7 

 + 7 



+ 11 



+ 12 



-6 -11 



— 8 —13 



— 9 —14 



