Geophone having electromagnetic damping means

摘要: A geophone for sensing vibrations having a metal housing, permanent magnet positioned in the center of housing with predetermined spacing between exterior and spring assembly pair disc shaped deflectable torsion springs, one which is located top other bottom coil form fabricated from an electrically conductive material, adapted to enclose magnet, ends being engage cooperate springs movement direction substantially parallel axis wherein further includes surface contiguous defining at end thereof spaced axially aligned circumferentially extending walls passageway encloses wire solid section formed material shown.