the chronometer, the record of which was kept at the Observatory, was very
regular, and was found by observations of transits of stars during the
week to be +1.3 seconds per day, which is the same as the recorded rate.



Specimen of a Determination of Rate of Ut₃ Fork.


Temp.=27° C. Column 1 gives the number of the spark or the number of the
second. Column 2 gives the number of sinuosities or vibrations at the
corresponding second. Column 3 gives the difference between 1 and 11, 2
and 12, 3 and 13, etc.

July 4, 1879.
1 0.1 2552.0
2 255.3 2551.7
3 510.5 2551.9
4 765.6 2551.9
5 1020.7 2552.1
6 1275.7 2552.0
7 1530.7 2551.8
8 1786.5 2551.4
9 2041.6 2551.7
10 2297.0 2551.5
-------
11 2552.1 255.180 = mean ÷ 10.
12 2807.0 + .699 = reduction for mean time.
13 3062.4 + .003 = correction for rate.
14 3317.5 + .187 = correction for temperature.