by Derek Howse
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Radar at sea
Background to discovery
The sea chart
The clocks and watches of Captain James ...
Some early tidal diagrams
Nevil Maskelyne, the seaman's astronomer
Longitude
Geodesy
The sea-man's kalender, or, An ephemerid...
Tractatus de globis et eorum usu
Astronomia Carolina
Time-reckoning for the twentieth century