Poles, bar magnets, the Earth's field and the instruments that measure them.
The magnetic pole model, solenoids and bar magnets as dipoles, torque and energy of a magnet in a field, end-on and broadside-on fields, magnetic scalar potential and the general dipole field, the Earth's magnetism and its elements, the dip circle and apparent dip, neutral points, tangent and moving-coil galvanometers and shunts, deflection and oscillation magnetometers, and Gauss's law for magnetism.