FIG. 3. Place an electrised phial on wax; take a wire (_g_) in
form of a _C_, the ends at such a distance when bent, as that the
upper may touch the wire of the bottle, when the lower touches the
bottom: stick the outer part on a stick of sealing-wax (_h_), which
will serve as a handle; then apply the lower end to the bottom of
the bottle, and gradually bring the upper end near the wire in the
cork. The consequence is, spark follows spark till the equilibrium
is restored. Touch the top first, and on approaching the bottom,
with the other end, you have a constant stream of fire from the wire
entering the bottle. Touch the top and bottom together, and the
equilibrium will instantly be restored, the crooked wire forming the
communication.