Geophone EVS-1 or 2

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Item Geophone EVS-1 or 2
Item code
Description 2A and 2B = Marsh detectors
Manufacturer Electro-Tech Labs
Donor E.E. Jones
Location Houston Geoscience Center
Serial number Black and white"Black and white" is not a number.
Taxonomy GSH248

For marsh operation, the junction between the top shank and case is sealed with an O-ring; cable entry is made through the top shank and sealed by a packing gland arrangement. A hexagonal nut, easily accessible with an ordinary crescent wrench, adjusts the pressure desired on the packing gland. For land operation, the top shank and cable are removed and replaced by a land cap and rubber seal. Cable entry is made through the side of the land cap, and the cable is anchored firmly to an insulated terminal inside the Cap