50 



Extra Observations of Magnetometers, 1841. 



August 20. 1 



September 25. j 



September 25. 



Gottingen 



Declina- 



Bifilar 



Balance 



Gottingen 



Declina- 



Bifilar Balance] 



Gottingen 



Declin.v- 



Bifilar 



Balance 



Mean Time of 



tion. 



Cor- 



Cor- 



Mean Time of 



tion. 



Cor- 



Cor- 



Mean Time of 



TTOV 



Cor- 



Cor- 



Observation. 





i-ected. 



rected. 



Observation. 





rected. 



rected. 



Observation. 



1 i*Ji> . 



rected. 



rected. 



d. li. m. s. 



- 



Sc. Div. 



Jlic. Div. 



(I. h. m. s. 



■ 



Sc. Div. 



Mtc. Div. 



d. h. m. s. 



/ 



Sc. Div. 



Mic. Div. 



20 22 40 



135-28 



531-0 





25 4 46 30 







909 



25 5 53 30 





655-2 





45 



135-82 





695 



48 30 





764-7 





55 



147-23 







50 



136-02 



531-5 





50 



141-87 







56 30 







666 



55 



136-30 





691 



51 30 







1032 



58 30 





702-9 





23 



136-97 



533-8 





53 5 



1 



812-0 





6 



164-14 







5 



137-17 





691 



30 



822-6 





1 30 







619 



10 



137-83 



532-5 





55 



( 



829-0 





3 30 





783-5 





15 



138-10 





693 



55 



121-40 







5 



188-98 







20 



138-30 







56 30 



58 5 



30 



55 



5 



I 



849-7 

 854-6 

 861-0 



910 



6 30 

 8 30 



10 



11 30 

 13 30 





794-9 



823 



September 25. 



130-45 





190-50 . 



1007 















760-3 





25 I 57 30 







916 



1 30 







802 



15 



141-12 







2 



153-14 







3 5 



J 



875-1 





16 30 







689 



2 30 





664-3 





30 



861-1 





18 5 



( 



834-2 





4 4 42 



( 155-82 

 . 161-38 

 ( 165-54 







55 



( 



843-6 





30 



\ 



824-8 





5 







5 



135-42 







55 



\ 



809-8 





5 18 







6 30 







823 



19 42 



i 194-20 







6 30 







1070 



8 30 





779-7 





20 



{ 213-43 







10 



129-78 







9 42 



( 142-20 



152-54 



( 154-80 







20 18 



(221-56 







11 30 







975 



10 







21 30 







781 



13 30 





804-8 





10 18 







23 30 





592-6 





15 



124-62 







11 30 







898 



25 



205-27 







16 30 







686 



13 30 





757-0 





26 30 







1000 



18 5 





784-6 





15 



142-73 







28 30 





620-3 





30 



799-5 





16 30 







1005 



30 



182-91 







55 





802-7 





18 30 





690-5 





31 30 







655 



20 



161-94 







20 



138-30 







33 30 





660-7 





21 30 







882 



21 30 







907 



35 



199-70 







23 5 



1 



863-0 





23 30 





705-7 





36 30 







682 



30 



864-3 





25 



149-36 







38 30 





637-0 





55 



889-0 





26 30 







907 



40 



204-40 







24 42 



( 192-05 

 \ 183-33 

 ( 179-95 







28 30 





676-9 





41 30 







841 



25 







30 



139-52 







43 5 



1 



693-0 





25 18 







31 30 







894 



30 



680-7 





26 30 







1045 



33 30 





690-2 





55 



667-4 





28 5 



( 



863-2 





34 42 



( 139-05 







45 



189-03 







30 





841-9 





35 



<^ 130-32 







46 30 







943 



55 



( 



827-9 





35 18 



( 121-07 







48 5 



i 

 ( 



604-1 





30 



128-98 







36 30 







847 



30 



615-5 





31 30 







965 



38 30 





793-2 





55 



620-2 





33 5 



( 



752-8 





39 42 



( 180-65 







50 



182-25 







30 



\ 



757-7 





40 



<^ 184-00 







51 30 







878 



55 



( 



767-4 





40 18 



158-90 







53 5 



1 

 1 



643-3 





35 



161-58 







41 30 



\ 





827 



30 



649-4 





36 30 







927 



43 30 





795-0 





55 



659-6 





38 30 





776-6 





45 



171-42 







55 



178-90 







40 



131-47 







46 30 







695 



56 30 







763 



41 30 







940 



48 30 





620-0? 





58 5 



( 



622-8 





43 30 





731-3 





50 



131-60 







30 



\ 



617-8 





45 



136-37 







51 30 







838 



55 



\ 



606-0 





Aug. 20* 221' 1841. Observations made during a thunder-storm. 22"^ 5 



0". Very heavy rai 



n. 231' 15m. Clearing olT. 231". Therm 



ometers. 



Bifilar, 60°-4 ; Balance, 61°-0. The times of the Bifilar and Balance observ 



ations are 2^ 30*^ aft 



er those in the first column. 





From the above it would not appear that the mean directions of the 



magnets were affect 



ed by the thunder-storm: the vibratior 



is of the 



Declination magnet were occasionally very considerable, and this appeared 



particularly the cas 



=! when the fall of rain was unusually 1 



leavy ; — 

 vas com- 



thus, at 221' 50m^ .^yijgn the rain was exceedingly violent, the arc of vibrati 



3n amounted to abou 



t 17', while at 2211 45", when the fall i 



paratively slight, the arc of vibration did not exceed 3'. E. R. 







Kussell 



Sept. 251 4h 1841. -\Vhen the scale of the Bifilar Magnetometer went 



or was going out o 



f the field of the reading telescope, 5Ir 



turned the torsion circle so as to bring the scale into the field again ; the folk 



wing were the readi 



ags of the torsion circle at the times am 



lexed : — 



211 2m 30', 114°, usual position; 41' O"", 108° ; 5i' 20'", 110°; 5i' 25"', 111° 



; 51' 40'", 109° ; 5i> ; 



50"', 111° ; 61' 25"', 112°. The readin 



g of the 



Bifilar scale was estimated at the following times, the scale 'beino- in si"-h1 



., but beyond the ve 



rtical wire of the reading telescope ; 2i 



' 2"^ 30», 



] 51' 18-" 30s eii 23'" 30^ At S^ 48'" 30^ the scale was out of sight, so that t 



he reading must ha\ 



'e been less than is here noted. 





, The observations of the Bifilar Magnetometer are reduced to the torsion 



cii'cle reading 114 . 



See Introduction. 





Sept. 25<i 1841. Bifilar Thermometer, 2i', 62°-0 ; 4^, 65°-l ; 5^, 65°-0 ; 



eh, 64°-9 ; 71', 64°-2. 







Balance Thermometer, 2i», 60°-2 ; 41', 63°-2 ; 5i', 63°-2' ; 



&-, 63°-2 ; 71', 63°-2 





- 



