Nautical Science in Its Relation to Practical Navigation Together With a Study
Nautical Science in Its Relation to Practical Navigation Together With a Study
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In our eReader you can find the full English version of the book. Read Nautical Science in Its Relation to Practical Navigation Together With a Study 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 Nautical Science in Its Relation to Practical Navigation Together With a Study
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No matter how carefully a transit instrument may be made and how accu- rately adjusted, the line of sight seldom describes the meridian. The meridian of the instrument is not the true meridian and the time we note on the clock is not the time that the star actually crossed the meridian of the place. Even if the instrument could be placed in perfect adjustment, it would not long remain so : the slightest jar, or the unequal heating of various parts of it, would throw it out. So delicate are the ...larger instruments that the heat from a hand placed on one of the stone piers will appreciably change the level of the instrument and cause the sight-line to describe a curve slightly different from the meridian. While thus the transit instrument can never be exactly in the meridian, yet, from observations made on several stars, some to the north and some to the south of the zenith, its various errors can always be deter- mined, and the effect of these errors on the time of passage of a star can readily be calculated.
What to read after Nautical Science in Its Relation to Practical Navigation Together With a Study?
You can find similar books in the "Read Also" column, or choose other free books by Charles Lane Poor to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
No matter how carefully a transit instrument may be made and how accu- rately adjusted, the line of sight seldom describes the meridian. The meridian of the instrument is not the true meridian and the time we note on the clock is not the time that the star actually crossed the meridian of the place. Even if the instrument could be placed in perfect adjustment, it would not long remain so : the slightest jar, or the unequal heating of various parts of it, would throw it out. So delicate are the ...larger instruments that the heat from a hand placed on one of the stone piers will appreciably change the level of the instrument and cause the sight-line to describe a curve slightly different from the meridian. While thus the transit instrument can never be exactly in the meridian, yet, from observations made on several stars, some to the north and some to the south of the zenith, its various errors can always be deter- mined, and the effect of these errors on the time of passage of a star can readily be calculated.
What to read after Nautical Science in Its Relation to Practical Navigation Together With a Study?
You can find similar books in the "Read Also" column, or choose other free books by Charles Lane Poor to read onlineMoreLess
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