330 MR. HE. H, GRIFFITHS ON THE LATENT 
the following table shows the results of all those experiments at different rates 
where 0) = 40°'1 approximately. 














TaBLe XXI. 
|| Let t = time of rising 1 millim. of bridge-wire, then 
Experiment. Date. (4) | F f 1 
Fe ep Pe rm) Ae all aed rom formula 
a -2 =2 8 . 
| x 107. | x 10-. | x 1077.) x 167%. Gi. 
If Sept. 17 001600 5299 || 331 176 930 492 ‘001606 
IX. Oct. 27 001626 =| 5310 | 327 173 921 489 ‘001619 
VI. Peed | = SOOM Ss alieoa sonny urs Os 166 906 494. 001805 
IT. Sept. 23 002152 5670 || 263 149 847 480 002104: 
III. » 24 008152 EY) I > OF 76 605 478 007930 
| | 


Experiments II. and III. were only performed with the object of ascertaining the 
effect of changes of rate. Although the differences between tr* may appear consider- 
able, it must be remembered that this constant was only required in order to reduce 
experiments at different rates to some standard rate; in reality, when we consider 
that we are dealing with the fourth power of rv the uniformity is remarkable. 
If we plot the values of (d6,/dt), obtained from the formula 

dé, ir 
Go) =a ROR eh (1, 
the results are in close agreement with the experimental ones, especially when the rate is 
between 5:2 and 5:5 (the extreme limits of rate during the Latent Heat experiments, 
the usual value being about 5°3). True, if we assume (d6,/dt), = 7°/92000 our results 
would be nearly as close over the above limited range, but Experiments II. and III. 
indicate that the true relation is more nearly given by the previous expression. In 
any case, the difference between the experiments and the results as deduced from 
(A) do not differ by 1 in 100 over the above range of rate, and a difference of 1 in 
100 in Q, would only cause a difference of about 1 in 10,000 in L. 
Taste XXII.—The experiments at 30° give the following results. 







| 1 | From formula 
Experiment. | Date. (=) vr. | 8x10". | tx 1078. B 
| at }s- | (infra). 
| | 
TV. Sept. 29 ‘002330 | 5-280 629 333 002314 
VIII. Oct 2 002380 | 5320 632 337 | 002383 
VII. | ” 7 002568 | 5416 619 335 002560 
Wo | 7 005973 | 6°750 515 348 | 006178 

