The Mercurial Shower
Cement a piece of wood into the lower part of the neck of an open
receiver, and pour mercury over it. After a few strokes of the pump,
the pressure of the air on the mercury will force it through the pores
of the wood in the form of a beautiful shower. If you take care that
the receiver is clear and free from spots or dust, and it is dry
weather, it will appear like a fiery shower, when exhibited in a dark
room.