[ 3 66 ] 
confirmed by the experiments made at Pello in Lap- 
land, by the French academicians. 
4°. I obferved feveral times very exactly at Ponoi, 
the declination of the magnetic needle i° io' Eafl. 
5°. Exaft obfervations of the inclination of the 
needle made in different places of our globe, com- 
bined with thofe made long ago on the declination, 
would be very interefling and proper for the ad- 
vancement of our knowledge, as to the theory of 
magnetifm, which hitherto is but little underflood. 
It is the difficulty of making fuch obfervations, and 
obtaining accurate refults, which has difcouraged phy- 
ficians and travellers ; but it is furprizing that fo little 
has been done in this matter, fince Dr. Daniel Ber- 
noulli furnifhed us with new ideas for conflrudting a 
machine fit for determining the true magnetic incli- 
nation, in a Memoire, which gained the prize pro- 
pofed for this fubjedt by the Paris Academy, in 1743. 
He got an inclinatory needle conftrudled at Bafle, 
upon new principles, and the experiments he made 
allured him of luccefs ; he found the inclination at 
Bade 7 1 § degrees. 
Mr. Euler, the fon, made ufe of the fame compafs 
at Berlin, but by employing a method entirely 
different from that of Dr. Bernoulli. He gives the 
particulars thereof in the Memoirs of the Academy 
of Berlin, 1 7C5. After a great number of obfer- 
vations, he found the inclination to he then at Berlin 
between 72! and 73 degrees. At Peterlburg I got 
conflrudled a like machine, and ufcd it for determin- 
ing the inclination at Peterfburg, Kola, and Ponoi ; I 
employed both the methods of Meffi Bernoulli and 
Euler, and found a wonderful agreement in the re- 
fults 
