Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy

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                                     Section XI. Auxiliary Tables for the
     reduction of the observations of
     Coincidences.

70. The range of the Intervals of Coincidences in
these experiments is not indicated in the tables given in 
Section III. The table of log n-2/n <s>[?]</s> which is
placed below includes all that are required here. The
method of using it is the same as in the preceding Series.
     The tables used before for the Correction for Arc were
sufficient for the present experiments.

The range of temperature in the experiments now
made greatly exceeded that for the experiments in the mine.
In extending a table, so as to include an increased range
of physical conditions, there will always be some doubt
as to the propriety of selection of that mathematical
function which is assumed to increase proportionally with
the indications of the physical measurer. I have here
assumed that the changes of the logarithms of the
temperature-correction are simply proportional to the changes
of thermometer-reading. The table below, therefore, is formed
from the table in Section III by simple addition and subtraction
of <s>equal</s> a constant number.
The table used for barometrical correction is the same which
was used before.
                            
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Manuscript details

Author
George Biddell Airy
Reference
PT/54/5
Series
PT
Date
1855
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Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy, 1855. From The Royal Society, PT/54/5

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