1928 – UK
‘Every fundamental particle has an antiparticle – a mirror twin with the same mass but opposite charge’
‘It appears that the simplest Hamiltonian for a point-charge electron satisfying the requirements of both relativity and the general transformation theory leads to an explanation of all duplexity phenomena without further assumption’
1931 – UK
‘A magnetic monopole is analogous to electric charge’
A magnetic monopole is a hypothetical particle that carries a basic magnetic charge – in effect, a single north or south magnetic pole acting as a free particle.
Until recently no one has observed a monopole.
TIMELINERelated articles
- Freezing magnetic monopoles: How dipoles become monopoles and vice versa (phys.org)
- MoEDAL looks to the discovery horizon (cerncourier.com)
A History of Science 
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