Lodestone Compass: Chinese or Olmec Primacy?

@article{Carlson1975LodestoneCC,
  title={Lodestone Compass: Chinese or Olmec Primacy?},
  author={John B. Carlson},
  journal={Science},
  year={1975},
  volume={189},
  pages={753 - 760}
}
Considering the unique morphology (purposefully shaped polished bar with a groove) and composition (magnetic mineral with magnetic moment vector in the floating plane) of M-160, and acknowledging that the Olmec were a sophisticated people who possessed advanced knowledge and skill in working iron ore minerals, I would suggest for consideration that the Early Formative artifact M-160 was probably manufactured and used as what I have called a zeroth-order compass, if not a first-order compass… Expand
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