Balance ok Vertical Force Magnetometer. 



xliii 



Table 6. — Observations of Deflection of the Balance Magnet resting upon the 



Agate Planes, January 6, 1848. 







Bar E. 



Order 



Bar W. 



Order 



Bar E. 



Order 



Bar W. 











Dis- 



of 



Obser- 

 vation. 



N. end 



of 

 Obser- 

 vation. 



N. end 



of 

 Obser- 

 vation. 



N. end 



of 



N. end 



Deflec- 



Deflec- 



Log. 

 tan. m. 





tance of 

 Bar. 



up. 



up. 



down. 



Obser- 

 vation. 



down. 



tion at 

 37°. 



tion at 

 32°. 



Value of k. 



Balance. 



Balance. 



Balance. 



Balance. 



Feet. 





Mie. Div. 





Mic. Div. 





Mic. Div. 





Mic. Div. 



Mic. Div. 



Mic. Div. 







Away 



1 



+ 36-7 



14 



+ 69-5 







27 



- 49-0 











2-6 



2 



+ 267-0 



13 



+ 383-5 



15 



- 201-5 



26 



- 382-2 



308-5 



309-0 



7-94533 



0-0000099 



2-4 



3 



+ 333-5 



12 



+ 471-5 



16 



- 282-0 



25 



- 479-7 



391-7 



392-3 



8-06003 



■0000099 



2-2 



4 



+ 444-1 



11 



+ 632-0 



17 



- 401-2 



24 



- 625-5 



525-7 



506-5 



8-18828 



•0000099 



2-0 



5 



+ 612-2 



10 



+ 875-5 



18 



- 583-5 



23 



- 850-5 



730-4 



731-5 



8-33067 



•0000099 



1-8 



6 



+ 907-5 



9 



+ 1238-2 



19 



- 890-0 



22 



-1227-0 



1065-7 



1067-4 



8-49577 



■0000099 



1-7 



7 



+ 1184-5 



8 



+ 1500-5 



20 



-11250 



21 



-1505-5 



1328-9 



1331-0 



8-58925 



•0000096 



Away 



6 



- 66-5 



11 



+ 28-5 



1 



- 44-5 















2-6 



7 



+ 190-2 



10 



+ 338-0 



2 



- 280-7 



5 



- 349-5 



289-6 



290-1 



7-94533 



0-0000101 



1-8 



8 



+ 899-0 



9 



+ 1172-0 



3 



- 912-5 



4 



-1188-0 



1045-4 



1047-5 



8-49577 



•0000103 



Table 7. — Observations of Deflection of the Balance Magnet suspended horizontally 

 by the Declinometer Thread, January 10, 1848. 



Distance of 



Deflecting 



Bar. 



Observed 

 Deflec- 

 tion. 



Mean 

 Observed 

 Deflec- 

 tion. 



Value of 

 1 + *. 



Deflection 

 Corrected 



for 

 Torsion. 



Value of 



One 

 Sc. Div. 



Resulting 

 Deflec- 

 tion. 



Temp, of 



Deflecting 



Bar. 



Feet. 



M { 1. 



" { N. 

 " { N. 



Sc. Div. 



26-96 

 23-78 



56-83 

 48-09 



129-88 

 104-98 



Sc. Div. 

 25-37 



52-46 



117-43 



1-00851 



Sc. Div. 



25-59 



52-91 



118-43 



0-746 



19 5 

 39 28 

 88 21 



32-0 



From the deflections, Table 7, and the formula 



M 



= r 3 tan«(l+4 + -4)> 



we 



find 



r r* 



M 

 log — = 9-13614 



\og Pl = 9-88791 - log q x = 9-11654 



From the previous equation, 



tan u = 



M 1 



X *- 3 (l+^-+?i) 



