EXPEDITION TO POINT BAIMXMV. ALASKA. 483 



(5) February 28, 1883, I 1 ' 13 m a. m. to 3 1 ' 37'" a. in. (lot Unyen time, rend justed instrument 

 Plane of detorsion in magnetic meridian 40 22'; turned to 310 22', with lixed and movable. 



mirrors at 50; suspended magnet and turned to 235 01', with movable mirror at 50, by means 



of the screw, 2=75 21'; hence sca.le value as in preceding case. 



(G) At 6 p. m., March 23, Gottingen time, the suspended mirror touched fixed mirror owing to 



stretching of threads; raised suspension at 6 b 45 m p. m. 



(7) At 6 h 45 a. m., March 25, Gottingen time, suspension further shortened ; again at 7 h 10" 

 p. in., same duy. 



(8) At 3 h a. m., April 21, Gottingen time, fixed mirror read 486; changed to 500 before taking 

 the 3 a. in. observations. 



Increasing scale readings denote increase of horizontal foice. 



