  This work reviews the origin, development, completion, and outcome of a
trans-elastic ultracentrifuge project of Mexico's Nuclear Center through 1971
to 1986. The project had its origin in the search for an effect that supposedly
would validate Birkhoff's gravity theory over Einstein's General Relativity.
For this purpose an extraordinary ultracentrifuge was built which deserved the
1973 National Award for Instruments (Mexico). The ultracentrifuge was also used
to investigate the feasibility of uranium enrichment by solid state
centrifugation. Highly enriched uranium was obtained, but in small quantities.
