Welcome to Ghost Rider Investigations Friday, February 07 2025 @ 01:37 pm UTC

GRI Mark I Geophone

  • Contributed by:
  • Views: 898
Articles Our nearly finished construction of the GRI Mark-1 Geophone!

[youtube:0v3B0Gnev-U]

Tomorrow, we'll finish the construction with a Plexiglas top and new foam and assorted adjustments!