Annual Report of the Commissioner of the General Land Office to the Secretary of the Interior
3900.a The horizontal plates read by opposite verniers to single minutes, which is the least count of the full vertical circle; prismatic ... _ There are several good reasons why the regulations in the Manual of Surveying governing the surveys in the United States can not be ... at midnight; another is the thick cloudy weather which obscures the star Polaris; another is that Polaris being at a great altitude, onlyanbsp;...
| Title | : | Annual Report of the Commissioner of the General Land Office to the Secretary of the Interior |
| Author | : | United States. General Land Office |
| Publisher | : | - 1904 |
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