Editorial note — Chapter X
Reading edition
[Footnote 104: At this period, and for long afterwards, mariners estimated their longitudes by dead reckonings, or by the observed variations of the compass; both very uncertain guides.--E.]
Reading edition
[Footnote 104: At this period, and for long afterwards, mariners estimated their longitudes by dead reckonings, or by the observed variations of the compass; both very uncertain guides.--E.]