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the_o angle_n and_o consequent_o as_o well_o have_v perform_v the_o work._n how_o to_o take_v the_o plot_n of_o a_o field_n at_o two_o station_n when_o the_o field_n be_v so_o irregular_a that_o from_o one_o station_n you_o can_v see_v all_o the_o angles_n let_v cdefghiklmno_n be_v a_o field_n in_o which_o from_o no_o one_o place_n thereof_o all_o the_o angle_n may_v be_v see_v choose_v therefore_o two_o place_n for_o your_o station_n as_o a_o and_o b_o and_o set_v the_o semicircle_n in_o a_o direct_v the_o diameter_n to_o the_o second_o station_n b_o there_o make_v the_o instrument_n fast_o with_o the_o index_n take_v all_o the_o angle_n at_o that_o end_n of_o the_o field_n as_o cdefghik_n and_o measure_v the_o distance_n between_o your_o instrument_n and_o each_o angle_n measure_v also_o the_o distance_n between_o the_o two_o station_n a_o and_o b._n second_o remove_v your_o instrument_n to_o the_o second_o station_n at_o b_o and_o have_v make_v it_o fast_o so_o as_o that_o throug_n 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