Geophone 75

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Item Geophone
Item code
Donor Charlie Klutts
Location Houston Geoscience Center
Serial number NMI-38"NMI" can not be assigned to a declared number type with value -38.
Taxonomy IMG2189
  1. 38. NML No permanent magnets. Two coil windings are mounted on the back side of the basic unit Case is brass with white metal liner. Basic unit, shown at right, is all brass. All components except coil windings are attached to rectangular piece in center which pivots at bottom and causes two vertical bars, behind rectangular piece, to move vertically within the wire wound coils. Case has single number 7 stamped above cutaway area. (Unit, at left, is mislabeled #36