THE 



SCIENTIFIC PROCEEDINGS 



ROYAL DUBLIN SOCIETY. 



Vol. XV. (U.S.), Io. 4. 



FEBRUARY, 1916. 



ON THE PATH OF A SMALL PERMEABLE BODY 

 MOVING WITH NEGLIGIBLE ACCELERATION 

 IN A BIPOLAR FIELD. 



BY 



PHILIP E. BELAS, B.A., A.R.C.Sc.L, 



AND 



MARCUS HARTOG, M.A., D.Sc. (N.U.I). 



UNIVERSITY COLLEGE, CORK. 

 [COMMUNICATED BY PROFESSOR WILLIAM BROWN, B.SC.] 



(PLATE I.) 



[/I ufhors alone are responsible for all opinions expressed in their Communications-] 



DUBLIN: 



PUBLISHED BY THE ROYAL DUBLIN SOCIETY, 



LKINSTER HOUSE, DUBLIN. 



WILLIAMS AND NORGATE, 



U, HENRIETTA STREET, COVENT GARDEN, LONDON, W.C. 

 1916. 



Price Sixpence. 



