= * Resinesieusil Magnetic. ‘Attra 
galvanic oa by the ess. nis 
dipping into cups 0 
~The whole will be more readily understood by a reference to the 
annexed drawing ; 3 AB is the horizontal magnet, about seven inches 
long, ¢ and moveable on an axis at the center : its two extremities when 
placed in a horizontal line, are about one inch from the north poles 
of the upright magnets C and D.  G and F are two large tumblers 
containing diluted acide in each oy which is immersed a plate of zine 
surrounded with copper. 1, m, s, t, are four brass thimbles soldered 
to the zinc and copper of the batteries and filled with mercury. 
e galvanic magnet AB is wound with three strands of coppet 
bell wire, cach abba twenty five fe ong 5 the similar ends of these 
are twisted together so as to form ty wires, which project he- 
yond the extremity B, and dip into “4 Prinhtes i% 
PY To the wires q, 7, two other wires are soldered so as to proje 
an opposite direction, and dip into the thimbles 7, m. ‘The wires of 
the galvanic magnet have thus, as it were, four projecting ends; and 
by i inspecting the figure it will be seen that the extremity m, which 
dips into the cup atigched to the copper of the’ pest in Ge corre: 
ct in 
spon ~ the extre r es with the zin , 
action, | if the end B is depressed unt! 
q, 7 dips into the eups s, t, AB ins becomes a powerful mag- 
net, having its north pole at B; this of course’ is repelled by the 
north ae D, while at the same time it is attracted by C, the pos: 
tion is consequently changed, and 0, p comes in contact with the 
mereury in./, m; as soon as the communication is formed, the poles 
-are reversed, and the position again changed. If the tumblers be 
