@raprap,
According to Heisenberg in his book, Nuclear Physics, the equasion E=hv, in Plank's formula, E is identical with the binding energy of the duteron... Hasenohrl had also pointed out in pre relativist days the relationship, following from the electrodynamics of moving objects, that m= E/c squared... He failed to compute the proportionality factor correctly, but I think more significantly; He was solving for mass which we all have enough of, and was not solving for Energy which no one has enough of... It was a simple matter to turn the equasion around...