File:Astronomy. Determination of time, longitude, latitude, and azimuth (1913) (14594914759).jpg

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Identifier: astronomydetermi00usco (find matches)
Title: Astronomy. Determination of time, longitude, latitude, and azimuth
Year: 1913 (1910s)
Authors: U.S. Coast and Geodetic Survey Bowie, William
Subjects: Spherical astronomy
Publisher: Washington, U.S. Govt. print. off.
Contributing Library: Wellesley College Library
Digitizing Sponsor: Boston Library Consortium Member Libraries

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Text Appearing Before Image:
ox, as canreadily be seen from illustration No. 5. The handwheels have a diameter of 33 mm., are 116 mm.apart, and equidistant from the middle of the telescope, allowing ample space for manipulating ineither position of the eyepiece. The pitch of the micrometer screw is about 48.4 threads per centimeter, or 123 per inch.In the telescope of Transit No. 2 the angular value of one revolution of the screw is 2.5 equatorialtime seconds, nearly. As the gearing of the handwheel shaft to the micrometer screw is as 2to 1 it follows that the hands must produce rotary motion of one revolution in about 5s for anequatorial star. The adjustment for colhmation is made by means of two nuts, x, illustration No. 4, upona small screw fastened to the micrometer box, which in turn is mounted by dovetad slidesupon a short flanged cylinder, y. The latter is fixed in position by the screws, Ji, which, whenloosened, also permit of a rotary motion for adjusting the transit wire into the vertical. Neither No 4.
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TRANSIT MICROMETER. No. 5.

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Flickr tags
InfoField
  • bookid:astronomydetermi00usco
  • bookyear:1913
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:U_S__Coast_and_Geodetic_Survey
  • bookauthor:Bowie__William
  • booksubject:Spherical_astronomy
  • bookpublisher:Washington__U_S__Govt__print__off_
  • bookcontributor:Wellesley_College_Library
  • booksponsor:Boston_Library_Consortium_Member_Libraries
  • bookleafnumber:18
  • bookcollection:Wellesley_College_Library
  • bookcollection:blc
  • bookcollection:americana
Flickr posted date
InfoField
30 July 2014


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