Paddle Wheels For P 11 (Timing)

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Item Paddle Wheels For P 11 (Timing)
Item code
Description Various wheels for Timing Lines
Manufacturer Petty Geophysical
Circa 1927
Model
Donor Petty Collection
Location The University of Texas at Austin
Serial number
Taxonomy GSHP012

Time marker wheel display. These are some of the spoked wheels that were custom made to suit the whim of different looking lines across the record, and a supervisor could usually recognize records made by different seismologists who took their wheels with them when they changed parties

GSHP012.jpg