Evaluation of some aspects of relativity

If the relativity theory is to predict experimental results about the rates of clocks, the time intervals must be defined in such a way that they are capable of measurement. When this is done the confusion which has been associated with the theory is explained. The theory is shown to be self-consistent up to a point, but an error is then made in the course of a `thought experiment¿. The result given does not follow from the `experiment¿ but from an additional assumption made implicitly. The same kind of error is made in the `thought experiments¿ in Einstein´s later papers. The results again follow from implicit assumptions and not from the `experiments¿. His final assumptions that time dilatation is a consequence of acceleration or gravitational potential are supported by the results of recent experiments.