and antineutrino velocities over a range of energies, at Fermilab. A comparison of neutrino and photon speeds from supernova SN1987A puts a limit of about 1 part in 10 8 on their speed difference. Electron Relativistic Mass Variations In the early 20 th century there was an alternative theory by Abraham that is now little known, because these experiments rejected it in favor of SR. A critical review of the experimental evidence concerning the Lorentz model compared to the Abraham model was given in: Farago and Jannossy, Il Nuovo Cim. Vol5, No 6, pg 1411 (1957). Proton Relativistic Mass Variations Calorimetric Test of Special Relativity The beam power at SLAC is measured using temperature rise in a calorimeter, for electrons of ~17 and 20 GeV and beam currents up to ~15 microamperes. Their results confirm SR with a resolution of about 30%, and are "many orders of magnitude larger than predicted by the theory of autodynamics", of which Carezani is the author (and also member of this experimental group). 7. Tests of Length Contraction At this time there are no direct tests of length contraction, as measuring the length of a moving object to the precision required has not been feasible. There is, however, a demonstration that it occurs: A current-carrying wire is observed to be electrically neutral in its rest frame, and a nearby charged particle at rest in that frame is unaffected by the current. A nearby charged particle that is moving parallel to the wire, however, is