2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/87699The first attainment of longitudinal spin polarisation in a high energy electron (positron) storage ring is described.2 pages. No figures. Latex. Paper 2 of a set of 5 . others are physics/9901038 physics/9901042 physics/9901043 physics/9901044Accelerator PhysicsClassical PhysicsQuantum PhysicsII. Longitudinal Electron Spin Polarisation at 27.5 GeV in HERAtext