He-D3 Polarization observed in Prominences
  Spectro-polarimetric measurements of the D3-HeI 5876 A line profile in 35 prominences have been performed in 2003 with the Gregory-Coud\'e Telescope in Locarno. Two different experimental techniques (ZIMPOL and Beam-exchange method) have been successfully employed to determine all four Stokes components. Both give compatible results. The preliminary results as well as the measurement techniques are reported. 
Renzo Ramelli, Michele Bianda (Istituto Ricerche Solari Locarno,   IRSOL)