| 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.... | |
| 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.... | |
| 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... | |
| 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... | |
| 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... | |
| 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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