Detector Dual Coil

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Item Detector Dual Coil
Item code
Description
Manufacturer Keystone
Circa
Model
Donor
Location Houston Geoscience Center
Serial number
Taxonomy GSH116

1934 Electronic circuit used “Acorn” vacuum tube. Used for reflection shooting, natural frequency about 25-30 cycles. Highly damped and more sensitivity than needed. Could be changed in laboratory for-refraction work, diaphragms then being used mostly for centering the mass which was magnetically suspended. Period approached infinity.

GSH116.jpg