324 Prof. S. P. Thompson. On the [Feb. 14, 



Table V.— 0=5.) 



Angle. 



Nat. sine. 



P calculated. 



3? observed.. 



o 



















5-739 



o-i 



-002848 



-00267 



11-538 



0-2 



-005809 



0-00545 



17 -457 



0-3 



0*008772 



-00848 



23 -578 



0-4 



-011715 



-01083 





U D 



u ui"*oyo 



f\ .AT ACQ 



36 -869 



0-6 



-018257 



'01759 



44 -427 



0-7 



-021829 



-02183 



53 -130 



0-8 



-025741 



-02564 



58 -211 



0-85 



-027819 



-02645 



64 -158 



0-9 



-030000 



-02801 



71 -805 



0-95 



-032297 



-03081 



90 -000 



1-0 



-034722 



-03365 



The values of P set down as observed in the last column of the 

 preceding tables were obtained by noting the deflexions produced on 

 a tangent magnetometer, with very small needles, by a magnet placed 

 at the requisite distance (measured horizontally at right angles to the 

 magnetic meridian), capable of rotation in a vertical plane passing 

 through its centre and through that of the magnetometer. The read- 

 ings were then multiplied by such a constant as would make the value 

 at 44 0, 427 coincide with the calculated value at the same angle. The 

 departures at other parts of the scale are partly due to errors of 

 observation, partly due to the fact that the distance between the poles 

 of the magnet is less than the distance between the ends. 



Table VI.— 0=6,) 



Angle. 



Nat. sine. 



P calculated. 



0° 











5-739 



o-i 



-001708 



11-538 



0-2 



-003428 



17-457 



0-3 



-005163 



23 -578 



0-4 



-006966 



30-000 



0-5 



-008814 



36 -869 



0-6 



-010735 



44 -437 



■ 0-7 



-012749 



53-130 



0-8 



-014796 



58 -211 



0-85 



-015975 



64-158 



0-9 



0-017150 



71 -805 



0-95 



-018348 



90 -000 



1 -o 



-019592 



