The MSFC vector magnetograph is described in:
M. J. Hagyard, N. P. Cumings, E. A. West, and J. E. Smith 'The MSFC
Vector Magnetograph', Solar Physics 80, p. 31 (1982),
and in
M. J. Hagyard, N. P. Cumings, and E. A. West 'The New MSFC Solar
Vector Magnetograph', Proceedings of Kunming Workshop on Solar Physics
and Interplanetary Travelling Phenomena, C. deJager and Chen Biao,
eds., Science Press, p. 204 (1985).