Description of a Magnetic Electrical Machine. 221 
the evil that arises from the scattering of the mercury, not only in 
point of cleanliness, but expense. A little ether, spirits of wine, 
or naphtha, being poured on the mercury, is readily inflamed. The 
same experiment may be satisfactorily performed, by pouring any 
of those liquids into a test tube C, and holding it over the break. 
The vapor will speedily be ignited by the magnetic spark ; or, dip 
a piece of paper in ether and hold it over the break and it will soon 
ignite. 
To produce rotation by magnetic electricity. . 
Fig. 10. A, a vertical horse-shoe magnet, on a tripod stand B; 
C, improved flood cups; D, the wire frames, having two little cups 
at top to hold a drop of mercury; E, a connecting fork. Mercury 
being poured into the flood cups C, and the single break X being 
used, on placing the connecting wire as in the figure, continuous 
Vou. XXXITI—No. 2. 29 
