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" Let the board be placed about one foot in front of the theodolite, a lamp or candle placed on the shelf at its lower edge ; and let the board be slipped up or down, until the pole-star can be seen through the hole. The light reflected from the paper will... "
Elements of Surveying: With the Necessary Tables - Page 100
by Charles Davies - 1830 - 300 pages
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Elements of Surveying: Including a Description of the Instruments and the ...

Surveys - 1837 - 249 pages
...it, for the purpose of holding a candle. About twenty-five minutes before the time of the greatesl eastern or western elongation of the pole-star, as...is to be observed, and the star has not yet reached the most easterly point, it will move from the line towards the east, and the reverse when the elongation...
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Elements of Surveying: With a Description of the Instruments and the ...

Charles Davies - Surveying - 1839 - 261 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...is to be observed, and the star has not yet reached the most easterly point, it will move from the line towards the east, and the reverse when the elongation...
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Elements of Surveying: With a Description of the Instruments and the ...

Charles Davies - Surveying - 1839 - 261 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...is to be observed, and the star has not yet reached the most easterly point, it will move from the line towards the east, and the reverse when the elongation...
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Elements of Surveying, and Navigation, with a Description of the Instruments ...

Charles Davies - Navigation - 1841 - 359 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...is to be observed, and the star has not yet reached the most easterly point, it will move from the line towards the east, and the reverse when the elongation...
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Elements of Surveying, and Navigation: With Descriptions of the Instruments ...

Charles Davies - Navigation - 1854 - 322 pages
...the shelf at its lower edge ; and let the board be slipped up or down, until the pole-star can beseen through the hole. The light reflected from the paper...is to be observed, and the star has not yet reached the most easterly point, it will move from the line towards the east, and the reverse when the elongation...
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Manual of United States Surveying: System of Rectangular Surveying Employed ...

J. H. Hawes - Public lands - 1868 - 210 pages
...shown by the tables of elongations, let the theodolite he placed at a convenient point and leveled. Let the board be placed about one foot in front of...is to be observed, and the star has not yet reached the most easterly point, it will move from the line toward the east, and the reverse when the elongation...
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Manual of United States Surveying: System of Rectangular Surveying Employed ...

J. H. Hawes - Electronic book - 1868 - 210 pages
...on the shelf at its lower edge; and let .the board be slipped up or down, until the pole-star caii be seen through the hole. The light reflected from...is to be observed, and the star has not yet reached the most easterly point, it will move from the line toward the east, and the reverse when the elongation...
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INSTRUCTIONS TO THE SURVEYORS GENERAL OF PUBLIC LANDS OF THE UNITED STATES,

INSTRUCTIONS TO THE SURVEYORS GENERAL OF PUBLIC LANDS OF THE UNITED STATES. - 1871
...sliown 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...is to be observed, and the star has not yet reached the most easterly point, it will move from the line toward the east, and the reverse when the elongation...
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Elements of Surveying and Leveling; with Descriptions of the Instruments ...

Charles Davies - 1871 - 270 pages
...pole-star can be seen through the hole. The light, reflected from the paper, will show the cross-hairs in the telescope of the theodolite. Then, let the...an eastern elongation that is to be observed, and if the star has not yet reached the most easterly point, it will move from the line toward the east,...
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SYSTEM OF RECTANGULAR SURVEYING

J.H. HAWES - 1873
...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...is to be observed, and the star has not yet reached the most easterly point, it will move from the line toward the east, and the reverse when the elongation...
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