21 seconds.
28 seconds.
36 seconds.
44 seconds.
51 seconds.
60 seconds.
60 - 21 = 39
39 ÷ 5 = 7.8 = time of one interval.
_Résumé_.
No. 1 7.8 seconds. 7.42 × 5 = 37.10
2 7.1 seconds. + 1.00
3 7.6 seconds. -----
4 7.4 seconds. 38.10
5 7.2 seconds. 38.10 ÷ 7.42 = 5.133
---- (Above) 5.159
-----
Mean = 7.42 seconds. Effect of support and scrape = - .026
Mean of second determination was 256.094
Applying correction (scrape, etc.) - .026
-------
Corrected mean 256.068
Result of first determination 256.072
-------
Final value 256.070
NOTE--The result of first determination excludes all work except the
series commencing July 4. If previous work is included, and also the
result first obtained by Professor Mayer, the result would be 256.089.
256.180
256.036
256.072
256.068
-------
Mean = 256.089
The previous work was omitted on account of various inaccuracies and want
of practice, which made the separate results differ widely from each
other.
The Formulæ.