Alfred Bucherer

Alfred Heinrich Bucherer (* 9 July 1863 in Cologne; † 16 April 1927 in Bonn) was a German physicist, who is known for his experiments on relativistic mass.

Based on those ideas he developed a theory in 1906, which also included the assumption that the geometry of space is riemannian.

And contrary to Albert Einstein, he didn't connect his rejection of the aether with the relativity of space and time.

But in 1908 Bucherer conducted some experiments as well, and obtained results which seem to confirm the Lorentz-Einstein theory and the principle of relativity.

This lasted until 1940, when similar experimental equipments were sufficiently accurate to confirm the Lorentz-Einstein formula, [4] see Kaufmann–Bucherer–Neumann experiments and Tests of relativistic energy and momentum.