Stargazing: Past And Present
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In our eReader you can find the full English version of the book. Read Stargazing: Past And Present 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 Stargazing: Past And Present
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119. — Plan of the Greenwich Transit Circle.
We must defer giving more explanation of the prac- tical working of the instrument until we have considered the clock used in connection with it, and we shall then show how the observations are made. One important 24(5 STARGAZING : PAST AND PKESKNT. [book iv.
point to wlii('li attention should be given is the method of illuminating the wires in the eyepiece. This is the arrangement. There is a lamjD at the end of one of the pivots whic]] is hollow, t...he light falls on a mirror, placed in the centre of the telescope, of such a shape and in such a position that it will not intercept the light from the object-glass falling through the diaphragms on to the eyepiece. The mirror is ring-shaped, some- thing like the brim of a hat, and is carried on two pivots, so that it can be placed diagonally in the tube, or at right angles to it ; it is arranged just outside the cone of rays from the object-glass, so that when the mirror is diagonally placed the light will be grasped directly from the lamjj at the end of the axis and reflected dow^n and mixed up with the light coming from the star into the eyepiece.
What to read after Stargazing: Past And Present?
You can find similar books in the "Read Also" column, or choose other free books by Lockyer, Norman, Sir, 1836-1920 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
119. — Plan of the Greenwich Transit Circle.
We must defer giving more explanation of the prac- tical working of the instrument until we have considered the clock used in connection with it, and we shall then show how the observations are made. One important 24(5 STARGAZING : PAST AND PKESKNT. [book iv.
point to wlii('li attention should be given is the method of illuminating the wires in the eyepiece. This is the arrangement. There is a lamjD at the end of one of the pivots whic]] is hollow, t...he light falls on a mirror, placed in the centre of the telescope, of such a shape and in such a position that it will not intercept the light from the object-glass falling through the diaphragms on to the eyepiece. The mirror is ring-shaped, some- thing like the brim of a hat, and is carried on two pivots, so that it can be placed diagonally in the tube, or at right angles to it ; it is arranged just outside the cone of rays from the object-glass, so that when the mirror is diagonally placed the light will be grasped directly from the lamjj at the end of the axis and reflected dow^n and mixed up with the light coming from the star into the eyepiece.
What to read after Stargazing: Past And Present?
You can find similar books in the "Read Also" column, or choose other free books by Lockyer, Norman, Sir, 1836-1920 to read onlineMoreLess
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