P. E. Chase on Mechanical Polarity. 313 
described in this paper, with the exception of the glass prisms, 
was made by Messrs. Clark & Sons of Cambridgeport, aud we 
would here especially express our indebtedness to Mr. George 
4 Clark for his great ingenuity in planning and executing the me- 
chanical details. We reserve for another article an account of 
the results of our measurements. 
Art. XXXII.— Experiments in Mechanical Polarity; by PLINY 
EarueE Cuase, M.A., S.P. A.S." 
_ I wAVE already published three simple experiments in mechan- 
Ical polarization (Proc. a 
Fo is ably owing to an analogous polarization of aerial and 
__ &etherial currents. Finding that my hypothesis was sustaine 
‘04S points of correspondence between the assumed influence of 
___ SFavitation-currents and the observed daily variations of declina- 
tion and inclination, I sought for some practical demonstration 
either alone or in conjunction with directing dises, currents may 
be 
in 
pe 
ost striking 
