108 



M. G. Wiedemann on Torsion. 



Series II. 

 Temp. 100°. 



B. 





T. 



E. 



v. 



3ST. 



Z. 



B. 





T. 



E. 



v. 



N. 



Z. 



grms. 

 831 



1 



10 



1 

 10 



1 



10 



1 



10 



1 



10 



1 



10 



1 



10 



1 



10 



263 

 289 



299 

 318 



334 

 348 



515 

 505 



502 

 494 



546 

 532 



529-5 



518 



511-8 

 502-5 



607 



582 



572 

 553 



537 

 524 



360 

 370 



372 



381 



329 

 343 



346 

 357 



363-8 

 372-5 



344 

 293 



273 

 235 



203 



176 



155 

 135 



130 

 113 



217 

 189 



183-5 

 161 



148 

 130 



14 : 8 

 i*3 : 9 

 l3 : 3 

 12 : 9 

 131 

 12-9 

 12-3 

 12-2 



435 

 435-5 



435-5 

 435-5 



435-5 

 436 



437-5 

 437-5 



437 

 437-5 



436-5 

 437-5 



437-8 

 437-5 



437-8 

 437-5 



min- 



20 

 50 



grms. 

 1831 



1 

 10 



1 

 10 



1 

 10 



1 

 10 



1 



10 



1 



10 



1 



10 



1 



10 



1 



10 



667 



517 



312 

 407 



600 



555-5 



619 

 522-5 



598 

 526 



660 



602*5 



592 



552-5 



656 

 602 



327 

 362 



327 



455-5 



608 

 513-5 



315 

 392 



270 

 368-5 



165 

 236 



245 

 313 



323 

 363 



253 



308 



577 

 542 



340 



61-5 



296 

 106-5 



285 

 123-5 



349 

 154 



433 

 290 



415 



289-5 



269 

 189-5 



403 



294 



250 

 180 



81-9 

 64-0 

 54 : 4 

 57*2 

 330 

 29-6 

 29 : 6 

 27 : 

 280 



497 



486 



460 

 460-2 



457 

 453-2 



444-5 

 444-5 



380-5 

 381 



452-5 

 457-5 



457-5 



457-5 



454-5 

 455 



452 

 452 



mir 



30 

 15 



1831 



1 



10 



657 

 514 



356 

 475 



301 

 39 



87-0 



506-5 

 494-5 







Therefore, while at ordinary temperature the diminution of 

 the oscillation-amplitudes is but very little affected by the load, 

 at the temperature of 100° C. it rises with it very rapidly, so 

 that on the load being increased from 770 to 2120 grams it 

 becomes three times as much as before, rising with every ten 

 oscillations from 27 up to 73 per cent, of the initial amplitude. 

 "When after a heavier load a lighter one is applied, the decre- 

 ment immediately falls to the previous value corresponding to 

 this lighter load. But if with the heavier load the wires are 

 caused to oscillate for a very long time, the decrement continu- 

 ally approaches nearer to that which they possess with the 

 lighter load*. The action of the heavier loading falls, there- 

 fore, really within the period of accommodation. 



25. Influence of Unequal Torsion at different Places. — The 

 unequal torsion of different parts of the same wire (§ 18) 

 may also have an influence upon the torsion-oscillations. 

 This might account for the fact observed by P. M. Schmidt f, 

 that the decrements of the oscillations of wires of different 

 lengths are not equal, but diminish as the length increases. 

 Otherwise there would be no reason why the different parts 



* Compare also Thomson, loc. cit. § 8. 

 t Wied. Ann. ii. pp. 48 & 241 (1877). 



