CHAPTER V. =Terrestrial Magnetism= 31

The Magnetism of the Earth.--Declination.--Exp. 45, To study the lines of force above and below a bar magnet placed horizontally.--The Dip or Inclination of the Magnetic Needle.--Exp. 46, To study the dip or inclination of the magnetic needle due to the action of the earth.--Discussion; Balancing Magnetic Needles.--Exps. 47-48, To study the inductive influence of the earth.--Discussion.--Natural Magnets.--Exp. 49, To test the effect of twisting a wire held north and south in the earth's magnetic field.--Exp. 50, To test for magnetism in bars of iron, tools, etc.