Abstract
By treating the field of a charge in a stationary orbit as a rotating field no radiation term arises. Stationary circular orbits of positronium are considered from this viewpoint, a new interparticle force being obtained. Bohr quantisation of canonical angular momentum leads to two sets of stationary states, one familiar and the other with properties which permit identification with the neutrino. Systems of one or two neutrinos and an electron afford models for charged pions and muons. Other systems are considered, one with properties which might permit identification with the proton.