108 MAGNETIC OBSERVATIONS 



perature at end of observations, (d) Remove No. 1, suspend 4 and repeat 

 observations (), again recording time and temperature at end. 



E. MiscELLAXEors INFORMATION. 



Table I gives the data for stations at which some magnetic results 

 have already been obtained. A reoccupation of as many of these as possible 

 will furnish valuable data for determination of the secular change. Only 

 descriptions for Nos. 1 and 2 at which observations .were made by Lieut. 

 Ackley, while attached to the Coast and Geodetic Survey, can be furnished; 

 as he was provided with a good magnetic outfit it is especially desirable to 

 reoccupy his stations and if possible on two or three days, as he had done. 



F. GENERAL INFORMATION. 



It is desirable to make duplicates of all of the observations, and after 

 these duplicates have been carefully revised, either they or the originals 

 should be forwarded to the Superintendent of the Coast and Geodetic Survey 

 as soon as possible, for reduction and possibly to furnish opportunity for 

 additional instructions before the close of the work. 



Immediately upon return of the Expedition the instruments should be 

 returned to the Superintendent of the Coast and Geodetic Survey for final 

 determination of constants, and it would be desirable if the observer himself 

 would take part in this final work, so as to eliminate possibility of any error 

 such as may be ascribed to personal equation. 



