He uses arsenious acid gas, which gives the electricity a greenish tint.

That mass of electricity becomes a perfect little cyclone.

It is funnel-shaped and spins around like a top.

When he moves the plate over a table, his cyclone catches up pennies, pens, pith balls and other small articles, and scatters them in every direction.
Cyclones never touch the equator, though the ocean ones are rare outside the torrid one.

They are caused by the meeting of contrary currents of winds, and are known under the names of hurricanes, typhoons, whirlwinds or tornadoes.