 ... three inches square, be nailed to the lower edge of it, for the purpose of holding a candle. About twenty-five minutes before the time of the greatest eastern or western elongation of the pole-star, as shown by the tables of elongations, let the theodolite...  Elements of Surveying: With the Necessary Tables - Page 100by Charles Davies - 1830 - 306 pagesFull view - About this book
 | Charles Davies - Navigation - 1854 - 446 pages
...about three inches square, be nailed to the lower edge of it, for the purpose of holding a candle. About twenty-five minutes before the time of the greatest...board be slipped up or down, until the pole-star can beseen through the hole. The light reflected from the paper will show the cross hairs in the telescope... | |
 | J. H. Hawes - Public lands - 1868 - 252 pages
...shown by the tables of elongations, let the theodolite be placed at a convenient point and leveled. Let the board be placed about one foot in front of....the board be slipped up or down, until the pole-star caii be seen through the hole. The light reflected from the paper will show the cross hairs in the... | |
 | Charles Davies - Leveling - 1871 - 448 pages
...about three inches square, be nailed to the lower edge of it, for the purpose of holding a caudle. About twenty-five minutes before the time of the greatest...The light, reflected from the paper, will show the cross-hairs in the telescope of the theodolite. Then, let the vertical spider's line be brought exactly... | |
 | United States. General Land Office - Public lands - 1881 - 138 pages
...shown by the tables of elongations, let the theodolite be placed at a convenient point and leveled. Let the board be placed about one foot in front of...light reflected from the paper will show the cross hair« in the telescope of the theodolite. Then, let the vertical spider's line be brought exactly... | |
 | Charles Davies - Surveying - 1883 - 578 pages
...at a convenient point and leveled. Let the board be placed about one foot in front of the transit, a lamp or candle placed on the shelf at its lower...hole. The light reflected from the paper will show the cross-wires in the telescope of the transit. Then let the vertical cross-wire be brought exactly upon... | |
 | Charles Davies - Surveying - 1883 - 614 pages
...the table of elongations (see Art. 164), let the transit be placed at a convenient point and leveled. Let the board be placed about one foot in front of the transit, a lamp or candle placed on the shelf at its lower edge, and let the board be slipped tip or... | |
 | United States. Bureau of Land Management - Surveying - 1890 - 192 pages
...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 of the instrument, a lamp or candle placed on the shelf at its lower edge ; and let the board- be slipped... | |
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