Notes On the Management of Chronometers And the Measurement of Meridian Distance
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Of these the most noteworthy example is supplied by the forty-feet instrument erected by Sir William Herschel at Slough.
FIG. 134. The 40-feet at Slough.
Lord Rosse's six-feet reflector again is mounted in a different manner. It is not equatorially mounted ; the tube, supported at the bottom on a pivot, is moved by manual power as desired between two high side walls, carrying the staging for observers, and so allowing the CHAP, xx. ] METHODS OF MOUNTING LARGE TELESCOPES. 295 293 STARGAZING : PA...ST AND PEESENT.
[BOOK v.
telescope a small motion in right ascension of about two hours. Our amateurs then may be forgiven for still FIG. 116. Liclractoi mounted 011 Alt-azimuth Tripod for ordinary Stargazing.
adhering to the alt-azimuth mounting for mere star- gazing purposes.
We must recollect that, with the alt-azimuth, we are CHAP, xx. ] METHODS OF MOUNTING LARGE TELESCOPES. 297 able to measure the position of an object with reference to the horizon and meridian ; but suppose we tip up the whole instrument from the base, so that, instead of having the axis of the instrument vertical, we incline it so as to make the axis, round which the instrument turns in azimuth, absolutely parallel to the earth's axis.
What to read after Notes On the Management of Chronometers And the Measurement of Meridian Distance?
You can find similar books in the "Read Also" column, or choose other free books by Charles Frederick Alexander Shadwell to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Of these the most noteworthy example is supplied by the forty-feet instrument erected by Sir William Herschel at Slough.
FIG. 134. The 40-feet at Slough.
Lord Rosse's six-feet reflector again is mounted in a different manner. It is not equatorially mounted ; the tube, supported at the bottom on a pivot, is moved by manual power as desired between two high side walls, carrying the staging for observers, and so allowing the CHAP, xx. ] METHODS OF MOUNTING LARGE TELESCOPES. 295 293 STARGAZING : PA...ST AND PEESENT.
[BOOK v.
telescope a small motion in right ascension of about two hours. Our amateurs then may be forgiven for still FIG. 116. Liclractoi mounted 011 Alt-azimuth Tripod for ordinary Stargazing.
adhering to the alt-azimuth mounting for mere star- gazing purposes.
We must recollect that, with the alt-azimuth, we are CHAP, xx. ] METHODS OF MOUNTING LARGE TELESCOPES. 297 able to measure the position of an object with reference to the horizon and meridian ; but suppose we tip up the whole instrument from the base, so that, instead of having the axis of the instrument vertical, we incline it so as to make the axis, round which the instrument turns in azimuth, absolutely parallel to the earth's axis.
What to read after Notes On the Management of Chronometers And the Measurement of Meridian Distance?
You can find similar books in the "Read Also" column, or choose other free books by Charles Frederick Alexander Shadwell to read onlineMoreLess
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