[17] _Cf._ Trouton, in _Nature_, Vol. 39, p. 393; and many optical
experiments by Mr. Trouton, Vol. 40, p. 398. Since then the above
described and depicted apparatus for electro-optic experiments has been
imitated in a neat, compact form by Prof. J. Chunder Bose, of Calcutta,
and with it he has obtained many admirable and interesting optical
results. See _Proc._ Roy. Soc.