60-i EXPEDITION TO POINT BAEROW, ALASKA. 



Observations for determining the absolute magnetic horizontal intensity Continued. 



. February 16, 1882. Instrument, theodolite mflgnetom- 

 iMiT No. 11. Magnet L,, deflecting at right angles to Mag- 

 net S,, suspended. Dintance r 1.25 feet. Observer, A. C. 

 Dark. 



Date, February 17, 1882. Instrument, tlieodolite magnetom- 

 eter No. 11. Magnet L,, deflecting at right angles lo Mag- 

 net S,, suspended. Distance r=1.25 feet. Observer, A. C. 

 Dark. 



Circle readings. 



No. A B Mean. 



E. 

 W. 

 E. 

 W. 

 E. 



Mean 



W. 



E. 

 W. 



E. 

 W. 



Mean 



280 30 

 49 



230 20 

 25 



35 



No. A B Mean 



30.0 



,a. o 



3S.O 



38.00 



20.5 

 25.5 



23.00 



Circle readings. 



o / 

 226 12 

 40 



226 00 

 10 

 20 



20 



12.5 

 41.0 



26.75 



"oirir 



11.0 

 20.0 

 10.67 



No. A B Mean. 



E. 

 W. 

 E. 

 W. 

 E. 



Circle readings. 



Mean 



W. 

 E. 

 W. 



E. 

 W. 



Mean 



230 10 

 26 



18 



230 10 

 30 



20 



No. A B Mean 



11.0 

 26.5 

 19.0 



18.83 



11.0 

 31.0 



21.00 



Circle readings. 



225 47 

 20 



225 35 

 40 

 59 



47.5 

 20.5 



34.00 

 "35.5~ 

 40.5 

 59.0 

 45.00 



Computation. 



Computation. 



Magnet East, 2 = 4 11.25 



Magnet West 2 u= 12. 33 



Mean 11.79 



= 2 05. 90 



Time of beginning 1* 15" 

 Time of ending 2 15 



Mean 



1 45 



Temp.- 1.4 

 Temp.- 0.8 



t=- 1.1 



Log'ms. 



r> 0. 29073 

 Sin. u 8. 56365 



8.55335 



Magnet East, 2 = 4 44. 83 



Magnet West, 2 u= 36. 00 



Mean 40. 42 



= 2 20. 21 



Time of beginning 1* 55" 

 Time of ending 2 30 



Mean 



2 12.5 



Temp.- 3.0 

 Temp.- 3.5 



=-3.25 



Log'ms. 



i 0. 09897 



r 0. ^'J073 



Sin. u 8. 61038 



m 



B 



8. 1*008 



Date, February 18, 1882. Instrument, theodolite magnetom- 

 eter No. 11. Magnet L,, deflecting at right angles to Mag- 

 net S,, suspended. Distance r= J. 25 feet. Observer.A. C. 

 Dark 



Date, March 17, 1882. Instrnment, theodolite magnetometer 

 No. 11. Magnet L,, deflecting at right augles to Magnet 

 S,, suspended. Distance r=l. 25 feet. Observer, A. C. 

 Dark. 



E. 

 W. 

 E. 

 W. 

 E. 



Circle readings. 



No. 



Mean. 



W. 

 E. 

 W. 

 E. 

 W. 



Mean. 



230 44 



40 



40 



230 38 



B Mean. 



40 



44.5 

 40.5 

 40.0 



41.67 



39.0 

 39.5 



~39.~25 



Circle readings. 



No. 



I 



226 16 

 15 



226 09 

 10 



B Me, 



17.0 

 15.0 



16.00 



09.5 

 11.0 

 03.5 



oao 



E. 

 W. 



E. 

 W. 

 E. 



Circle readings. 



No. 





Mean. 



W. 



E. 

 W. 



E. 

 W. 



Mean. 



231 54 



54 



53 



231 60 



B Mean. 



53.5 

 55.0 

 54.0 

 54.17 



60.0 

 55.0 



59. 50 



Circle readings. 



No. 



10 



o / 

 227 27 

 36 



227 34 

 27 



27 



B Mean. 



27.5 

 37.0 



32.25 



33.5 



27.8 



27.5 



29.~83~ 



Computation. 



Magnet East, 2 u= 4 25. 67 



Magnet West, 2 u= 3 1 . 25 



Mean 2R 46 



tt= 2 14. 23 



I o 



Time of beginning l b 21" < Tcmp.-ll. 5 

 Time uf ending 1 52 | Temp. 9. 5 



Computation. 



Mean 



1 36.5 



f = -10.5 



Log'ms. 



i 9. 69897 



1* 0. 29073 



Sin. u 8. 59147 



II 



8. 58117 



Magnet East, 2u= 4 21.92 



Magnet West, 2 u= 28. 17 



Mean 25. 04 



u= 2 12. 52 



Time of beginning l h 2,1" 

 Time of ending 1 48 



Temp. 

 Temp.+ 



t= 



Log'ms. 



i 9. 69897 



r 0. 29073 



Sin. 8. 58590 



Ht 8. 57560 

 If 



