Worlds' first filamentary NbTi magnet constructed from a prototype length of IMI (Birmingham) NbTi wire, 2km length, 0.375mm diameter.

This coil achieved 6.9 Tesla at 4.2K and 8.9 Tesla at 1.3K which was then a record for NbTi magnets. The conductor was not twisted during fabrication and the construction and test of this coil, including measuring the flux jumps and remanent field, demonstrated the need for twisting the filaments to reduce electro-magnetic coupling between them.