Jackpot! Angela's diligent work has located the chart we need for this summer's diving expedition to Ecuador. Housed at the Boston Public Library, scanned by them for us, and sent to me at PSU, the chart was surveyed in 1847 and reports soundings (depths of water) in fathoms (a fathom being six feet). I've been obsessing over this chart for months, now we have it and can make realistic plans for the diving operations. A bit of the chart is shown above.
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