1750
Steel magnets
John Michell, an English geologist, publishes A Treatise on Artificial Magnets, which describes how to make strong steel magnets and gives an account of his discovery of the inverse-square law for the attractive and repulsive forces of magnets.
1750
Aurora borealis
Perh Vilhelm Margentin writes a letter to the Swedish Academy of Sciences in which he comments on the effect of the aurora borealis on a magnetized needle.
1751
Franklin's electricity

1752
Kite experiment

1759
Mathematical magnets
Franz Aepinus, a German natural philosopher, publishes his Tentamen Theoriae Electricitatis et Magnetismi (“An Attempt at a Theory of Electricity and Magnetism”), the first book to consider electricity and magnetism in terms of mathematics.
1762
Tongue tests

1764
Electrophorus

1767
Law of force
Joseph Priestley, an English pastor and science enthusiast, deduces that the law of force between electric charges must be the same as Newton’s inverse-square law for gravitational force. His History and Present State of Electricity is released, in which all data available in the field at the time is reviewed.
1768
Magnetic inclination
Johannes Wilcke compiles and publishes the first magnetic inclination chart that includes measurements from around the globe.
1769
Steam condensing engine
