A Treatise On Land-Surveying: Comprising the Theory Developed From Five ...
A Treatise On Land-Surveying: Comprising the Theory Developed From Five ...
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In our eReader you can find the full English version of the book. Read A Treatise On Land-Surveying: Comprising the Theory Developed From Five ... 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 Land-Surveying: Comprising the Theory Developed From Five ...
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Instead of one plumb-line and a sight, two plumb-lmes may be suspended at the end of a horizontal rod, turning on the top of a pole.
The line thus obtained points to the East of the true line when the North Star is above Alioth, and vice versa. The North Star is exactiy in the Meridian about 17 minutes after it has been in the same vertical plane with Alioth, and may be sighted to after that interval of time, with perfect accuracy.
* The Noith Pole is very nearly at the intersection of the line... from I'oiaris to Alioth, and a perpendicular to this line fram the small star seen t^i the left of it in Fig. 202.
t If a Transit or Theodolite be nsed^ the cross-hairs must be illuminated by throwipg the light of a lamj^ into the telescope by its reflection from white paper Digitized by VjOOQ IC CHAP. VII.] Tariation of tbe Magnetic Needle.
193 Another bright star, which is on the opposite side of the Pole, and is known to astronomers as Q-amma CmmpeuB, also comes on the Meridian nearly at the same time as the North Star, and wiU thus assist in determining its direction.
What to read after A Treatise On Land-Surveying: Comprising the Theory Developed From Five ...?
You can find similar books in the "Read Also" column, or choose other free books by W M William Mitchell Gillespie to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Instead of one plumb-line and a sight, two plumb-lmes may be suspended at the end of a horizontal rod, turning on the top of a pole.
The line thus obtained points to the East of the true line when the North Star is above Alioth, and vice versa. The North Star is exactiy in the Meridian about 17 minutes after it has been in the same vertical plane with Alioth, and may be sighted to after that interval of time, with perfect accuracy.
* The Noith Pole is very nearly at the intersection of the line... from I'oiaris to Alioth, and a perpendicular to this line fram the small star seen t^i the left of it in Fig. 202.
t If a Transit or Theodolite be nsed^ the cross-hairs must be illuminated by throwipg the light of a lamj^ into the telescope by its reflection from white paper Digitized by VjOOQ IC CHAP. VII.] Tariation of tbe Magnetic Needle.
193 Another bright star, which is on the opposite side of the Pole, and is known to astronomers as Q-amma CmmpeuB, also comes on the Meridian nearly at the same time as the North Star, and wiU thus assist in determining its direction.
What to read after A Treatise On Land-Surveying: Comprising the Theory Developed From Five ...?
You can find similar books in the "Read Also" column, or choose other free books by W M William Mitchell Gillespie to read onlineMoreLess
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