Difference between revisions of "Geophone"

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{{Virtual Museum table
 
{{Virtual Museum table
|Taxonomy=IMG2189
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|Taxonomy=IMG2188
 
|Item=Geophone
 
|Item=Geophone
|Serial number=NMI-38
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|Serial number=NMI-37
 
|Donor=Charlie Klutts
 
|Donor=Charlie Klutts
 
|Location=HGC
 
|Location=HGC
 
}}
 
}}
#38. NML No permanent magnets. Two coil windings are mounted on the back side of the basic unit Case is brass with white metal liner. Basic unit, shown at right, is all brass. All components except coil windings are attached to rectangular piece in center which pivots at bottom and causes two vertical bars, behind rectangular piece, to move vertically within the wire wound coils. Case has single number 7 stamped above cutaway area. (Unit, at left, is mislabeled #36
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#37. NML Pendulum Cone Detector -Dr. Eugen Merten – Shell (circa 1950) Cone assembly in center pivots at bottom and, at top, has a wire wound coil which moves horizontally through a permanent magnet Stamped on top of the case is a triangle containing the letter L at top and the numbers 652 at bottom. Below the triangle is stamped MADE IN USA. A assembled cutaway unit is the basic unit removed from case. A horseshoe style magnet, mechanical magnification of motion, long moment arm, (shaped like a cone). Single leaf spring, small moving coil, adjustable resonant frequency, large voltage output, 7.4lbs.
  
[[File:GSH_ IMG2189.jpg|300px]]
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[[File:GSH_ IMG2188.jpg|300px]]

Latest revision as of 12:05, 23 July 2020

Item Geophone
Item code
Description
Manufacturer
Circa
Model
Donor Charlie Klutts
Location HGC
Serial number NMI-37"NMI" can not be assigned to a declared number type with value -37.
Taxonomy IMG2188
  1. 37. NML Pendulum Cone Detector -Dr. Eugen Merten – Shell (circa 1950) Cone assembly in center pivots at bottom and, at top, has a wire wound coil which moves horizontally through a permanent magnet Stamped on top of the case is a triangle containing the letter L at top and the numbers 652 at bottom. Below the triangle is stamped MADE IN USA. A assembled cutaway unit is the basic unit removed from case. A horseshoe style magnet, mechanical magnification of motion, long moment arm, (shaped like a cone). Single leaf spring, small moving coil, adjustable resonant frequency, large voltage output, 7.4lbs.

GSH IMG2188.jpg