A base line 16,876 feet long was measured on the beach at Icy bay. The line, with the exception of section _C_ to _D_, as shown below, was measured three times in sections of about 3,000 feet each. The distances given below in columns 1 and 2 were obtained with a 100-foot steel tape, and those given in column 3 with a 300-foot iron wire. These are rough measurements, made without the use of a plumb-bob and without taking account of temperature. The ground was quite smooth, with a rise of about five feet in the center; but section _C_ to _D_ was crossed by a stream channel about 300 feet broad and twenty feet deep. Throughout much of the distance the ground was covered with grass, which was only partially cleared away. The stations at the ends of the line were ten feet above high tide. The bearing of the line from the western base was S. 89° E., magnetic. _Measurements of Base Line_. ---------------------+-----------+-----------+-----------+---------- | 1. | 2. | 3. | Mean. ---------------------+-----------+-----------+-----------+---------- | _Ft. in._ | _Ft. in._ | _Ft. in._ | _Ft. in._ Western base to | | | | station _A_ | 3,179 10 | 3,178 7 | 3,178 9 | 3,179 1 Station _A_ to | | | | station _B_ | 2,355 2 | 2,354 1 | 2,354 2 | 2,354 6 Station _B_ to | | | | station _C_ | 3,589 0 | 3,587 9 | 3,586 0 | 3,587 7 Station _C_ to | | | | station _D_ | Rejected. | 2,609 2 | 2,609 5 | 2,609 3 Station _D_ to | | | Not | eastern base | 5,145 5 | 5,144 10 | measured. | 5,145 1 | | | | --------- Length of base line | | | | 16,875 6 ---------------------+-----------+-----------+-----------+---------- The measurements of angles were made with a gradienter reading by vernier to minutes. The error of the vertical arc was -3', and remained constant during the observations. {233} _Measurements of Angles at Western Base_.