580 
MR. W. C. D. WHETHAM ON IHE ALLEGED SLIPPING 
might be due to the suspension, and a small change in that part due to the water be 
inaj)preciable. 
Logarithmic decrement in air , . = ‘00284. 
Time of swing.= 9‘952 seconds. 
The logarithmic decrement due to the air, suspension, &c., is only about 2 per cent, of 
that due to the water. 
1 
1 
Temperature. 
Time of swing. 
Logaritlimic decrement. 
Uii silvered . 
1 
O 
12-6 
12-6 
12-7 
I 
9-766 
9-769 
9-772 
-19745' 
•19882 
•19830 
•19795 
12- 9 
13- 0 
9-741 
9-722 
•19694' 
•19729 
•19685J 
[(.) 1 
13-0 
13-7 
9-737 
9-686 
•19392' 
•19331 
•19330 j 
>(3) 
13-8 
9-725 
•19374' 
13-7 
9-739 
•19333 
>(4) 
13-8 
9-731 
•19412j 
13-18 
9-739 
•19579 
Silvered . 
13-6 
13-5 
9-884 
9-891 
•19588' 
•19717 
•19622, 
K5) 
13-55 
9-887 
•19642 
liesilvered . 
12-5 
12-6 
9-892 
9-892 
•19945 ■ 
•19943 
•19943 
>(6) 
12- 9 
13- 0 
9-882 
9-907 
•198111 
•19793 
•19775 
>(V) 
14-5 
14-6 
9-894 
9-885 
•19406' 
•19363 
•19331 
K8) 
9-75 
9-75 
9-891 
9-904 
•20688' 
•20695 
•20772, 
^9) 
Unsilvered . 
. 
10-0 
10-0 
9-939 
9-936 
•20687j 
•20721 
•20636^ 
>(10) 
12-7 
12-8 
9-917 
9-920 
•198811 
•19862 
•19860 J 
>(11) 
Between each of the series of observations marked (l), (2) . . . the suspending wire 
was re-adjusted, but an inspection of the results shows that they agree well among 
themselves, and that therefore the bulb might safely be moved for silvering. After 
