The meat of a white English walnut may be easily removed by heating the nut in an oven or on top of a stove, then using a knife to pry the shell open.
A Small Shocking Machine
The Shocking Coil as It is Used for Amusement, or in the Manner a Current is Given a Patient
An amusing as well as instructive shocking machine, usually called a medical coil, can be easily constructed from a discarded buzzer or electric bell, four binding posts, some pieces of insulated wire, two carbon rods, and a rheostat.
The Base upon Which the Buzzer and Rheostat are Fastened, and the Electrical Connections (Fig. 1, Fig. 2)