40 NORTHWESTERN BOUNDARY OF UNITED STATES. [bull. 174. 
MAGNETICS. 
Both the British and the American surveyors were equipped with 
arc outfit of instruments for determining the magnetic declination, 
dip, and force. The British instruments were standardized at Green- 
wich, and the resulting elements at 23 stations, as obtained by Captain 
Haig, were discussed by General Sabine and published in the Philo- 
sophical Transactions. An abstract of these results is printed on 
page 42 of this bulletin. 
As to the results by the American parties, much, unfortunately, 
must be left to inference, their results being, supposedly, in the "lost 
report." Mr. Campbell, writing in 1869, 1 says: U A magnetic survey 
extending over a range of 3° 20' in latitude and 4° in longitude, with 
the necessary observations of the magnetic elements of the astronom- 
ical stations, was also made.' 1 The work appears to have been done 
by Mr. J. S. Harris, whose results were secured by the United States 
Coast Survey. From these it appears that the observations covered a 
considerably larger extent of territory than that above indicated by 
Mr. Campbell. The character of the instrumental outfit and its fate 
in the field can be inferred, in part, from the two following pas- 
sages from General Parke's report of progress, written November 12. 
1859: "A full set of magnetic observations were made at one station'' 
(in 1858). 2 Also, U I am happy to report that we have got thus far 
through the season's work without any damage to our astronomical 
instruments. I regret, however, that we have been less fortunate 
with the magnetic instruments. The mule carrying these missed his 
footing and rolled down a precipitous bank. The magnetic theodo- 
lite will have to be replaced, and the other instruments will require 
repairing. " 3 
The Coast and Geodetic Survey has furnished from its manuscript 
registers the following table of results for declination, dip, and 
intensity. 
1 House Ex. Doc. No. 86, Fortieth Congress, third session, p. 95. 
2 Senate Ex. Doc. No. 16, Thirty-sixth Congress, first session, p. 6. 
3 Same, pp. 6-7 
