Amplifier Refraction (additional 2)
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| Item | Amplifier Refraction |
|---|---|
| Item code | |
| Description | Replaced P005 |
| Manufacturer | Petty Geophysical |
| Circa | 1928 |
| Model | |
| Donor | Petty Collection |
| Location | The University of Texas at Austin |
| Serial number | |
| Taxonomy | GSHP009 |
After determining optimal by field use of the prototype, a smaller and more rugged detector was made. This is the second generation of these new detectors with oscillating circuit inside instead of in the amplifier. (Natural frequency steady mass about 2 cycles.) A solenoid underneath steady mass gave remote control of condenser plate spacing for drift compensation.
