184 C. K. Wead—Intensity of Sound. 
Turn now to the results of the experiments. 
Table II is a specimen of the table made out for each of the 
forks used; it give 8 the mean time required for the amplitude 
to decrease. from 2 to 2”, the number of observations from which 
this mean is deduced, the resulting value of x, x computed from 
U 
: Zz 
the equation x=-085+ 028 _ 
the observed and computed meee Where these errors are 
large it will be seen that few observations were taken or 2’’ was 
small. 
, and the differences between 
Table III gives a abstract of table IL and similar abstracts 
for the other forks; it gives the number of ratios observed, the 
number of peters. the maximum value of 2’ an d the 
minimum value of 2’’ used in deducing x; the longest time 
uch dat 
think we may conclude that suaanoas (16) and Rat sue 
the “wea cates if ¢ oe term in the exponent is to be s 
depending on foes very much more refined methods bie 
these must be ihe 
TasBie IIT. 
1 2 3 4 6 6 Te 9 
Fork. |No, ratios.) No. obs. | Max. 2’| Min. 2” ‘Max. t. a | 6} | Av. dif. 
| j 
Ut. 23 20 3 7°30 | 180-003) +°006 
Ut; 9 38 15 2 20 065) 008) +°002 
Sol, 13 55 10 1 17°75 | 085) -028) +°007 
Ut, 9 37 6 1 1 122) 022) +002 
Sol, 8 32 5 1 028 +°012 
ed 4 54 5 1 6°87 237/044) +006 
Ut, | 3 17 4 1 3°33 °112/-100' +007 
“ 02 21 4 1 4°48 | -400) -050 
dae ee 23 5 1 5 | 225-062 +:008 
But while a good degree of confidence may be placed in the 
results, it should be observed that any considerable change in 
the mode of te eiibgs the fork will change x for any given 
amplitude. Thus 
Ut, in i III is properly — pe its case (not on ce hes saa 003 2. 
U 
ed to a board, without ca +0036 2. 
Ut, » its box, box clamped on its ngivhg fr 008 @. 
Ut, on its box, box standing on table and iron block m box -..« = = 075 + 004 2. 
Ut; ye rs box, box standing on table and iron block in box, _...time from . to 3 
Ut; on its ar Epon ear COONS sso See eee time from 5 to 3=7° i: sec. 
Ut, on Sol; time from 5 to 3=9°0 sec. 
Sol, on tox, prekeos ees ulea wows oe PEO Ne eae K—="085 +7028 2. 
Sol, on box, standing with comer on box, socicl eet 113-4028 z. 
