Detector Moving Coil Type (additional)

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Item Detector Moving Coil Type
Item code
Description Reflection
Manufacturer Petty Geophysical
Circa 1940
Donor Petty Collection
Location The University of Texas at Austin
Serial number
Taxonomy GSHP022

Moving coil type detector. As the evolution of seismic detectors proceeded they grew smaller and smaller, and were used in ever-growing numbers. This is the last of Petty made detectors. By this time, they-could be bought more cheaply from those who mass produced them for sale to the industry. This is the amplifier that was used for many years all over the world with the detector shown as Exhibit 19. This amplifier was the most trouble-free of any Petty ever made. It was made obsolete when the automatic volume control came into general use.