Jerry
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Big Issues
Key Tech Issues
Measurement
Dimensions
Longitude
John Harrison
H4 (Fourth Marine Chronometer, 1761)
K1 Chronometer
Attachments
wikipedia
Parents
H4 (Fourth Marine Chronometer, 1761)
Larcum Kendall
Marine Chronometers
Second voyage of James Cook (1772-1775)
Children
Cook Returns after Three Years, His Chronometer Still Accurate