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

View transcription
                                or we may otherwise express it,
Gravity below is greater than Gravity above by
1/19286 part, with an uncertainty of 1/270 part of
the excess.
     The acceleration of a seconds' pendulum below
is 2<sup>s</sup>.24 per day, with an uncertainty of less
than 0<sup>s</sup>.01.

<s>45</s>46. But it is to be remarked that this estimate of
the amount of uncertainty is obtained from the amount
of uncertainty in each mean as deduced separately from
the discordances of the individual results in the group
contributing to that mean. In comparing the means, we
shall see reason to suppose that the ultimate uncertainty
is greater. Thus, though the probable errors of the means of Series
1 and 3 are 10.4 and 11.0, the difference of the
means is 48: though the probable errors of the means
of Series 2 and 4 are 3.3 and 9.4, the difference
of the means is 24. It is likely therefore that some
<s>[?]</s> cause of irregularity has occurred, special to each
                            
Please login to transcribe

Manuscript details

Author
George Biddell Airy
Reference
PT/54/5
Series
PT
Date
1855
IIIF
Open IIIF manifest
(What's this?)
This is a link to the IIIF web URL for this item. You can drag and drop the IIIF image link into other compatible viewers

Cite as

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

Copy

Comments

Please login to comment