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" West at the same transit. The second principle was the substitution of a level or system of levels for the usual plumbline. The third principle was the casting in one piece, as far as practicable, of each of the different parts of the instrument, in order... "
Monthly Notices of the Royal Astronomical Society - Page 189
1859
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Monthly Notices of the Royal Astronomical ..., Volumes 22-24; Volumes 1861-1864

1862 - 874 pages
...arrangement for making successive observations in two positions of the instrument — face East and West at the same transit. The second principle was...hampered, and to secure, if possible, perfect rigidity." As to the soundness and the progressive character of these principles, no competent judges can differ....
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Monthly Notices of the Royal Astronomical Society, Volume 24

1864 - 260 pages
...arrangement for making successive observations in two positions of the instrument — face East and West at the same transit. The second principle was...hampered, and to secure, if possible, perfect rigidity." As to the soundness and the progressive character of these principles, no competent judges can differ....
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The English Cyclopaedia

1867 - 522 pages
...observations in two positions of the instrument, face east and face west, at the same transit. The second was the substitution of a level, or system of levels,...hampered, and to secure, if possible, perfect rigidity." An account of the observations with this sector was published in 1852. ('Astronomical Observations...
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Arts and Sciences: Or, Fourth Division of "The English Encyclopedia", Volume 5

Charles Knight - 1867 - 526 pages
...observations in two positions of the instrument, face east and face west, at the same transit. The second was the substitution of a level, or system of levels,...usual plumb-line. The third principle was the casting hi one piece, as far as practicable, of each of the different parts of the instrument, in order to...
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Catalogue of the Special Loan Collection of Scientific Apparatus at the ...

1876 - 957 pages
...observations in two positions of the instrument, face east and face west, at the some transit of a star. The second principle was the substitution of a level or system of level? for the previously used plumb-line. The third principle was the casting in one piece, as far...
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Lectures on Practical Astronomy and Astronomical Instruments

James Challis - 1879 - 456 pages
...involved in the construction of "Airy's Zenith Sector" are thus stated in page 57: "The first principle was the arrangement for making successive observations...hampered, and to secure, if possible, perfect rigidity." The inferences of latitude from the observations of zenith distance are all made by the intervention...
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