The Theory And Practice of Surveying: Designed for the Use of Surveyors And ...
The Theory And Practice of Surveying: Designed for the Use of Surveyors And ...
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In our eReader you can find the full English version of the book. Read The Theory And Practice of Surveying: Designed for the Use of Surveyors And ... Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Theory And Practice of Surveying: Designed for the Use of Surveyors And ...
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About five or ten minutes before the star cgmes to its culmi- nation read the altitude of the star with telescope direct Revolve the telescope on its horizontal axis and also on its vertical axis, relevel the instrument if the bubbles are not in the middle, but do not readjust the bubbles, and bring the tele- scope upon the star. Make two readings in this position.
Revolve the telescope and instrument again about their axes, relevel, and read again in first position. This gives two direct and t...wo reversed readings taken in such a way as to eliminate the error from collimation, the index error of vertical circle, and also the error of adjustment of the plate-bubbles. The result, when corrected for refraction and the pole distance of the star, should be the latitude of the place within the limits of accuracy and exactness of the vertical circle-readings.
376. Second Method. — An "artificial horizon," formed by the free surface of mercury in an open vessel, may be used in conjunction either with the transit or a sextant.
What to read after The Theory And Practice of Surveying: Designed for the Use of Surveyors And ...?
You can find similar books in the "Read Also" column, or choose other free books by Johnson, J. B. (John Butler), 1850-1902 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
About five or ten minutes before the star cgmes to its culmi- nation read the altitude of the star with telescope direct Revolve the telescope on its horizontal axis and also on its vertical axis, relevel the instrument if the bubbles are not in the middle, but do not readjust the bubbles, and bring the tele- scope upon the star. Make two readings in this position.
Revolve the telescope and instrument again about their axes, relevel, and read again in first position. This gives two direct and t...wo reversed readings taken in such a way as to eliminate the error from collimation, the index error of vertical circle, and also the error of adjustment of the plate-bubbles. The result, when corrected for refraction and the pole distance of the star, should be the latitude of the place within the limits of accuracy and exactness of the vertical circle-readings.
376. Second Method. — An "artificial horizon," formed by the free surface of mercury in an open vessel, may be used in conjunction either with the transit or a sextant.
What to read after The Theory And Practice of Surveying: Designed for the Use of Surveyors And ...?
You can find similar books in the "Read Also" column, or choose other free books by Johnson, J. B. (John Butler), 1850-1902 to read onlineMoreLess
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