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bear_v from_o we_o about_o north_n distant_a 6_o or_o 7_o league_n the_o mean_a variation_n by_o three_o azimuth_n compass_n and_o nine_o observation_n be_v 10°_n n._n westerly_n the_o same_o year_n november_n the_o 16_o variation_n at_o st._n helena_n 1°_n 4′_n n._n westerly_n the_o difference_n be_v 8°_n 56′_n the_o the_o meridian_n distance_n by_o plain_a chart_n be_v 20°_n difference_n of_o longitude_n be_v 21°_n 54′_n in_o sail_v direct_o between_o the_o two_o aforesaid_a place_n we_o raise_v or_o lay_v sea_n term_n the_o variation_n somewhat_o gradual_o therefore_o have_v the_o difference_n of_o longitude_n and_o the_o difference_n of_o the_o variation_n give_v between_o the_o two_o say_a place_n it_o may_v be_v suppose_v that_o the_o difference_n of_o longitude_n between_o the_o place_n may_v be_v find_v by_o observation_n of_o the_o variation_n i_o answer_v yes_o it_o may_v be_v near_o guess_v at_o and_o i_o know_v how_o to_o make_v proportion_n for_o find_v the_o difference_n 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the_o sun_n refraction_n be_v great_a then_o near_o the_o equinoctial_a if_o the_o variation_n of_o the_o compass_n be_v better_o know_v and_o table_n of_o the_o variation_n for_o all_o the_o most_o note_a part_n in_o the_o world_n as_o headlands_n cape_n island_n etc._n etc._n the_o table_n calculate_v to_o a_o certain_a year_n because_o of_o the_o increase_n and_o decrease_v of_o the_o variation_n and_o the_o difference_n of_o the_o variation_n between_o those_o place_n then_o the_o knowledge_n thereof_o will_v be_v almost_o as_o good_a as_o the_o longitude_n know_v some_o few_o place_n except_v and_o if_o there_o be_v 10_o or_o 20_o year_n difference_n in_o lay_v or_o set_v down_o the_o variation_n in_o some_o place_n it_o matter_n not_o provide_v the_o year_n be_v set_v down_o when_o the_o variation_n be_v so_o much_o at_o such_o place_n and_o whether_o increase_v or_o decrease_v as_o for_o example_n suppose_v in_o the_o year_n 1708_o one_o shall_v happen_v to_o be_v 10_o or_o 12_o league_n south_n off_o of_o c._n b._n esperance_fw-fr and_o find_v the_o variation_n 12°_n 28′_n as_o i_o tell_v you_o before_o the_o difference_n of_o the_o variation_n between_o the_o say_a cape_n and_o st._n helena_n be_v 8°_n 56′_n by_o which_o rule_n when_o you_o be_v at_o the_o say_a cape_n you_o may_v know_v what_o the_o variation_n be_v at_o st._n helena_n viz._n 3°_n 32′_n both_o n._n westerly_n increase_v the_o like_a example_n may_v be_v consider_v of_o most_o other_o place_n in_o the_o world_n that_o be_v not_o above_o 20_o or_o 30°_n distant_a asunder_o except_o about_o the_o azore_n i_o present_v you_o with_o another_o method_n viz._n when_o we_o have_v such_o or_o such_o variation_n at_o london_n thereby_o to_o know_v what_o variation_n there_o be_v in_o any_o other_o part_n of_o the_o world_n for_o if_o at_o this_o present_a writing_n i_o know_v exact_o what_o variation_n there_o be_v in_o all_o part_n of_o the_o world_n i_o believe_v it_o will_v be_v no_o hard_a 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