Ordinary Meeting, April 16th, 1867. 
Edward Schunck, Ph.D., F.RS., &c., President/in the 
Chair. 
Mr. Henry Charles Beasley was elected an Ordinary 
Member of the Society. 
“ On a New Form of the Dynamic Method for Measuring 
the Magnetic Dip,” by Sir William Thomson, M.A., D.C.L., 
F.RS., &c., Honorary Member of the Society. 
Seven years ago an apparatus was constructed for the 
natural philosophy class of the University of Glasgow, for 
illustrating the induction of electric currents by the motion 
of a conductor across the lines of terrestrial magnetic force. 
This instrument consisted of a large circular coil of many 
turns of line copper wire, made to rotate by wheel work 
about an axis, which can be set to positions inclined at all 
angles to the vertical. A fixed circle parallel to the plane 
containing these positions, measured the angles 'between 
them. The ends of the coil were connected with fixed 
electrodes, so adjusted as to reverse the connections every 
time the plane of the coil passes through the position per- 
pendicular to that plane. When in use, the instrument 
should be set as nearly as may be in the magnetic meridian. 
The fixed electrodes being joined to the two ends of a coil 
Proceedings — Lit. & Phil. Society. — Yol. YL— No. 15— Session 1866-7. 
