DETERMINATION OF THE RATE OF VIBRATION OF TUNING-FORKS. 
13 
Percentage 
N umber 
difference 
Tem¬ 
perature. 
° C. 
Date. 
Mark on fork. 
of 
measure- 
between 
highest and 
Vibration 
number. 
Correcte 1 
to 15° C. 
Mean. 
ments. 
lowest 
numbers. 
1878. May 2 
Sol 3 758 V.S. RK. . 
H 
7 
‘00755 
17-6 
384-330 
384-440 
] 
„ 3 
„ 3 
5? 99 
99 9) 
6 
6 
•00885 
•00338 
15- 9 
16- 9 
384-394 
384-349 
384-432 
384-429 
>384-437 
,, 4 
J 9 99 
5 
•00156 
15-5 
384-418 
384-439 
J 
May 4 
Mi 3 640 V.S. RK . . 
4 
•00125 
16-27 
320-321 
320-366 
„ 6 
5 
•00219 
15-12 
320-365 
320-369 
^320-372 
„ 6 
9 9 9 * 
4 
•00156 
16-27 
320-327 
320-372 
„ 7 
9 9 9 9 
5 
00312 
18-05 
320-273 
320-380 
I 
May 8 
Ut 3 512 V.S. RK (I) 
5 
•00234 
16-48 
256-266 
256-308 
1 
„ 8 
9 9 9 9 
5 
•00234 
15'58 
256-292 
256-308 
» 9 
9 9 9 * 
5 
•00195 
17-39 
256-217 
[256-284] 
^256-309 
,, io 
9 9 9 9 
2 
•00156 
16 30 
256 - 273 
256-310 
i 
„ io 
9 9 9 9 
2 
•00039 
16-35 
256-272 
256-310 
J 
May 11 
Ufcg 512 V.S. RK (II) 
4 
•00195 
17-99 
256-223 
256-307 
„ 13 
9 9 9 9 
4 
•00078 
17-3 
256-236 
256-301 
>256-306 
„ 14 
99 99 
4 
•00234 
16-14 
256-278 
256-310 
> 
I 
May 14 
Ut 4 1024 V.S. RK . 
4 
•00078 
1682 
512-446 
512-548 
■*> 
June 6 
9 9 99 
5 
'00664 
15-9 
512-487 
512-538 
„ 7 
4 
•00137 
18-07 
512-386 
512-559 
„ 8 
5 
•00312 
17-78 
512-399 
512-556 
j- 512-551 
„ io 
9 9 9 9 
6 
•00615 
1705 
512-451 
512-567 
„ 11 
3 
•00195 
16-22 
512-479 
512-548 
„ 11 
9 9 99 
3 
•00156 
16-28 
512-472 
512-544 
J 
June 17 
Ut 3 512 V.S. RK (I) 
4 
•00117 
15-01 
256-310 
256-310 
„ 17 
4 
•00078 
16-69 
256-260 
256-308 
„ 18 
99 9 9 
4 
•00234 
16-31 
256-273 
256-310 
„ 21 
9 9 9 9 
4 
•00312 
1975 
256 175 
256-309 
99 
5) 
„ 25 
99 9 9 
5 
5 
•00391 
•00195 
2116 
24-29 
256T37 
256*052 
256-310 
256-314 
-256-310 
„ 26 
Oct. 21 
4 
•00039 
25-69 
256-008 
256-309 
4 
00195 
17-0 
256-254 
256-310 
„ 22 
5 
•00117 
15-07 
256-302 
256-304 
„ 23 
9 9 9 9 
4 
•00156 
12-72 
256-378 
256-314 
-J 
A fork belonging to Sir William Thomson, and made by Marloye, gave the 
following numbers 
Date. 
Number 
of 
measure¬ 
ments. 
Percentage 
difference 
between 
highest and 
lowest 
numbers. 
Tem- 
peratu-e 
•c. 
Vibration 
number. 
Corrected 
to 15° C. 
Mean. 
1878. June 13 ... 
„ 15 ... 
5 
5 
•00391 
•00430 
17-48 
16-12 
255-938 
255-962 
255-945 
255-962 
J 255-953 
