262 
MAGNETIC SURVEY IN NORTH AMERICA. 
Fort Frances . . . 
Fort Alexander . . 
Norway House . . 
York Factory . . 
Cumberland House 
Carlton House . . 
Isle a la Crosse . . 
Athabasca .... 
Fort Simpson . . 
. 93 28*6 Franklin. 
. 96 21*4 Franklin. 
. 98 7 1 Taylor*. 
. 92 26 - 0 Franklin. 
. 102 19 - 4 Franklin. 
. 106 127 Franklin. 
. 107 53 - 8 Franklin. 
. Ill 187 Franklin. 
. 121 25*0 Franklin. 
Mean of two determinations. 
Mean of two determinations. 
Mean of two determinations. 
Mean of two determinations. 
These longitudes were determined with a greater number of chronometers than 
were carried by Lieut. Lefroy, and in some instances are the mean of determina- 
tions made by Sir John Franklin in his two journeys ; the stations were selected 
therefore as points of departure ; observations were made there with peculiar care, and 
the longitudes of intermediate stations, taken en route, were calculated from them 
successively. From July 1843 to September 1844 Lieut. Lefroy had the use of one 
chronometer only, (the other having met with an accident,) and it was found too 
irregular in its going to be relied on for long periods. The longitude was determined 
by lunar distances at certain stations, which are given in the Table. 
Wherever a station of observation is common to Sir John Franklin and Lieut 
Lefroy, the latitude or longitude determined by the former officer is inserted for 
comparison in the column headed “ from other determinations,” which also contains 
values taken by measurement from the maps which accompany the narrative of 
his journeys. Lieut. Lefroy’s observations along Peace River, and from thence 
by Lesser Slave Lake to the Saskatchawan, a line which was not taken by Sir John 
Franklin, are the first, it is believed, that have been published since those of Sir 
Alex. Mackenzie, and materially correct the course of that river, as laid down on 
the best maps. 
* Late Hudson’s Bay Company’s surveyor. This longitude is the mean of five observations of Jupiter’s 
satellites, the extreme difference amongst them being 11' 10". 
