A piece of magnetized steel used as an indicator on the dial of a compass and in magnetic and electrical apparatus.
- In 1837 Cooke and Wheatstone developed the electric telegraph which used an electric current to move magnetic needles and thus transmit messages in code.
- A 14 mm wide channel formed by two glass plates was made along the axis of the magnetic gradient within which a magnetic needle (a Teflon rod 3 cm long and 2 mm diameter) was floated.
- In particular he carried out many experiments including some on ballistics, some on the pendulum and a study of the variation of the magnetic needle.
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