the boy electrician - a. morgan (1948)
DESCRIPTION
A book about magnetism and electro-magnetism. It also has informations about telegraphy, bells and alarms, wires and accesories, microphones, electric motors and so on.TRANSCRIPT
DESCRIPTION
A book about magnetism and electro-magnetism. It also has informations about telegraphy, bells and alarms, wires and accesories, microphones, electric motors and so on.TRANSCRIPT