A Treatise On Astronomy, for the Use of Colleges And Schools
A Treatise On Astronomy, for the Use of Colleges And Schools
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In our eReader you can find the full English version of the book. Read A Treatise On Astronomy, for the Use of Colleges And Schools 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 A Treatise On Astronomy, for the Use of Colleges And Schools
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Thus, let the dark line in the figure represent the first position of the graduated circle when J?, K, are the points of the limb opposite the microscopes Aj By and M the zero of graduation. Let the fine line represent the second position of the circle, its centre, the line HK having come into the position H'K'j and M moved to if. The telescope will have Digitized by Google CHAP, v.] THE MURAL CIRCLE. 73 turned through the same angle as any line rigidly connected s p^ y^ ^ rr^'^'^ with the circ...le ; therefore HGH' is the angle to he found.
The two readings of A are respectively {MH or) M'H' and Jf' A, B {MHK or) M'lTK's^niirE'k.
The dlflference of the readings at A gives hOE'=2CkH\ B WK'^2CH'k.
The sum of these = 2 { CkH' + CH'k] = 2HCH^ and the half sum is the angle between the two positions of the telescope.
The centre of rotation, that Is, the point about which the instrument is supposed to have turned in passing from the first position to the second, Is not shewn on the figure ; and the Investigation, being Independent of this centre, shews that, even when the pivots are not cylindrical, and when con- sequently the centre of rotation Is not a fixed point, the readings of ^mch pair of microscopes will give a value of the angle free from errors of centering and from irregularity in the form of the pivots.
What to read after A Treatise On Astronomy, for the Use of Colleges And Schools?
You can find similar books in the "Read Also" column, or choose other free books by Hugh Godfray to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Thus, let the dark line in the figure represent the first position of the graduated circle when J?, K, are the points of the limb opposite the microscopes Aj By and M the zero of graduation. Let the fine line represent the second position of the circle, its centre, the line HK having come into the position H'K'j and M moved to if. The telescope will have Digitized by Google CHAP, v.] THE MURAL CIRCLE. 73 turned through the same angle as any line rigidly connected s p^ y^ ^ rr^'^'^ with the circ...le ; therefore HGH' is the angle to he found.
The two readings of A are respectively {MH or) M'H' and Jf' A, B {MHK or) M'lTK's^niirE'k.
The dlflference of the readings at A gives hOE'=2CkH\ B WK'^2CH'k.
The sum of these = 2 { CkH' + CH'k] = 2HCH^ and the half sum is the angle between the two positions of the telescope.
The centre of rotation, that Is, the point about which the instrument is supposed to have turned in passing from the first position to the second, Is not shewn on the figure ; and the Investigation, being Independent of this centre, shews that, even when the pivots are not cylindrical, and when con- sequently the centre of rotation Is not a fixed point, the readings of ^mch pair of microscopes will give a value of the angle free from errors of centering and from irregularity in the form of the pivots.
What to read after A Treatise On Astronomy, for the Use of Colleges And Schools?
You can find similar books in the "Read Also" column, or choose other free books by Hugh Godfray to read onlineMoreLess
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