Account of pendulum experiments undertaken in the Harton Colliery, for the purpose of determining the mean density of the earth, by G. B. Airy
quicker or slower than the clock pendulum: in fact it always vibrated slower. 31.<s>33.</s> Several coincidences were always observed <s>[?]</s> at the beginning of a swing, and several at the end. These gave the Interval of Coincidences nearly enough to enable me to fix upon the number of intervening coincidences. In general, some of the observed coincidences were rejected, so that from two to five coincidences were retained at the beginning, and a number at the end so corresponding that the difference of their means would represent an integral number of intervals (thus there might be 3 at the beginning and 5 at the end, or 4 at the beginning and 2 at the end). The mean of the first retained and the last retained being taken, the differences of means divided by the number of intervals gave a very exact value of Mean Interval. In the interval, the detached pendulum lost two vibrations on the clock pendulum. If then <s>[?]</s> the times of the first and last mean <s>w</s> be taken <u>from the clock face</u>, and if n be the number of seconds, referred to the clock, in the mean interval, the rate of the detached pendulum on the clock pendulum will be n2/n. The following tables contain all the values of log n2/n which are required here. For estimating the effect of any
Please login to transcribe
images
Manuscript details
 Author
 George Biddell Airy
 Reference
 PT/54/5
 Series
 PT
 Date
 1855
 IIIF

(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
Comments