EXPEDITION TO TOINT IJAJMMW, ALASKA. 



515 



l!l:-.IIH\<;x <>f THE HltnnKE li.U.ASl'E MAC, \i; To METEIl, TOCETIIEli WITH TIIK COffHKft- 

 2'0.\l>l\<: TKMl'KH.lTI^KK (/'.!//. >. I'HOM SEI'TEMHEK 11, I--''.', TO A fC r.sT 27, 



[Tabular valoee tmcorrected for rhanjre.s of temperaturu. A parallel ai^n |j indicate*! that the instrument was readjusted. Extreme sr.ila 

 divisions. () awl ^00: wlien the magnet passed off the zero end it, is indicated by fO ?); when oft* the opposite end by (800 i ?<; tho 

 extremes an- im Imlcd in tho monthly mean hourly values, Got tin gen time. Increasing scale numbers denote increasing vertical force.] 



Hourly 



of the Brooke balance maywtometer, at Uglaamie, Alaska, September, 1882. 



(Oottingen time.) 



To reduce reading* to an appro\iin:it"ly uniform series increase eacb reading by 40.7 -\- 05.0- 105.7 divisions ; it is found as follows: 

 Mean of 10 days, St-pt ember L'4 to OrtoNsr '.',. inVlusive, 414.1 ; mean of 10 days, October 4 to 13, inclusive, 4.~t4.x : diHrrcnre. 40.7 For origin of 

 n tun bor 65.0 see note to next month. One division of scale -= .0000803 part of tho vertical Imv. Monthly nn-aiM: Tempo rat.iiro, 35 1 ; mag- 



IHM vii'-u-r, 411.9; rod-iced mean. 517. G 



