Serapio, or Serapio Mauritania (Yuhanná ibn Sarapion), [2], [6].
Severtius, Jacobus, [5].
shielding, magnetick, by iron plate, [83], [85].
siderites (σιδερίτης) [8], [11], [143].
siegelstein [11].
silk suspension for magnetick iron, [29], [30].
Silvaticus, Matthæus, [3].
silver, loadstone for, [109], [110].