16 Charles Grass Page. 
was and it was soon noticed that the glass around the — 
we cannot in this notice even give a list, Among the instru- 
ments of his invention we will mention, as not having been de- 
scribed in this Journal, a voltameter of very convenient use, 
inte measures the volume of the gas by that of the displaced 
liquid, This is described in the American Polytechnic Jour- _ 
nal, tal ii, p. 15. | 
Am mong his earlier discoveries, in 1837, was the production, 
in a horse-shoe magnet, of musical vibrations, like those of | 
a tuning fork we believe, by the establishment, and espe- — 
cially the interruption, of a voltaic current in a flat spiral 
placed between the prongs of the magnet, with the plane of 
the spiral at right angles to the line of “the ‘poles of the mag- 
net. A year or two afterward he made a series of expe 
mental investigations on the action of the voltaic te § 
which were published i in this J rere 
; 
Seat sparks. eerie t was cea: about ‘ke 
years since a0 by the 1e Buel aie with some variations, 
