 | United States. Bureau of Land Management - Surveying - 1890 - 192 pages
...being somewhat larger than the diameter of the telescope of the transit. Let this board be so fixed to a vertical staff as to slide up and down freely,...pole-star, as shown by the tables of elongations, let the transit be placed at a convenient point and leveled. Let the board be placed about one foot in front... | |
 | Charles Davies - Navigation - 1837 - 342 pages
...1°51f 1°55' 1°58' 2° 1 i' • 12 2° 6' 1846 1°46' 1°48l' 1° 51' 1° 541' 1° 571' 2° 1' 2° 51' to a vertical staff, as to slide up and down freely : and let « small piece of board, about three inches square, be nailed to the lower edge of it, for the purpose... | |
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Take a board, of about one foot square, paste white paper upon it, and perforate it through the center; the diameter of the hole being somewhat larger than the diameter of the telescope of the theodolite. Let this board be so fixed to a vertical staff"... 
