Astronomical Photography With the Forty-Inch Refractor And the Two-Foot Reflector of the Yerkes Observatory
Astronomical Photography With the Forty-Inch Refractor And the Two-Foot Reflector of the Yerkes Observatory
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In our eReader you can find the full English version of the book. Read Astronomical Photography With the Forty-Inch Refractor And the Two-Foot Reflector of the Yerkes Observatory 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 Astronomical Photography With the Forty-Inch Refractor And the Two-Foot Reflector of the Yerkes Observatory
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Special attention was given to the perfection of the optical parts; to the stability of the mirror supports and the rigidity of the skeleton tube, in order that the adjustment or collimation of the optical parts might remain perfect during long exposures; and to the refinement of the driving mechanism and the guiding apparatus. In nearly all respects the same degree of care and refinement was used in the making of this instrument as is given in the case of the best modem refractors.
The perform...ance of the instrument in direct photography at the primary focus is highly satis- factory. As stated in my previous article, " the combination of (1) stability of position of the mirrors, (2) rigidity of skeleton tube, (3) smoothness of clock-driving, and (4) accuracy of guiding made pos- sible by the use of the double-slide plate-carrier, is so effective that when atmospheric conditions are good the image of a guiding star in the eyepiece does not wander so much as one one-hundreth of a millimeter during an exposure of three or four hours.
What to read after Astronomical Photography With the Forty-Inch Refractor And the Two-Foot Reflector of the Yerkes Observatory?
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To quickly assess the difficulty of the text, read a short excerpt:
Special attention was given to the perfection of the optical parts; to the stability of the mirror supports and the rigidity of the skeleton tube, in order that the adjustment or collimation of the optical parts might remain perfect during long exposures; and to the refinement of the driving mechanism and the guiding apparatus. In nearly all respects the same degree of care and refinement was used in the making of this instrument as is given in the case of the best modem refractors.
The perform...ance of the instrument in direct photography at the primary focus is highly satis- factory. As stated in my previous article, " the combination of (1) stability of position of the mirrors, (2) rigidity of skeleton tube, (3) smoothness of clock-driving, and (4) accuracy of guiding made pos- sible by the use of the double-slide plate-carrier, is so effective that when atmospheric conditions are good the image of a guiding star in the eyepiece does not wander so much as one one-hundreth of a millimeter during an exposure of three or four hours.
What to read after Astronomical Photography With the Forty-Inch Refractor And the Two-Foot Reflector of the Yerkes Observatory?
You can find similar books in the "Read Also" column, or choose other free books by Yerkes Observatory to read onlineMoreLess
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