Geophone
| Item | Geophone |
|---|---|
| Item code | |
| Description | |
| Manufacturer | McCullum Expl. |
| Circa | |
| Model | |
| Donor | Charlie Klutts |
| Location | HGC |
| Serial number | NMI-1"NMI" can not be assigned to a declared number type with value -1. |
| Taxonomy | IMG2152 |
- 1. NMI. McCullum Exploration used for early refraction shooting. No other marks visible. At left is complete unit and, at right, is inside basic unit. Basic unit has elaborate six spring suspension.
