M. Gr. Wiedemann on Tor 



•sion. 



porary as well as the permanent torsions are substantially the 

 same in both cases. 



Eeduced by -40. T =-350, P =+80-5. 



Eeduced by +40. T = -409, P = -8. 



30 60 90 120 



_30 - 60 - 90 - 120 



T 398 724 1056 1395 



-729 -657 -984 -1338 



P 84-8 93 105 118 



- 12 - 20 - 33 - 54 



P-P 3-5 12-5 245 37-5 



- 4 - 12 - 25 - 46 



T-P314 631-5 951 1277 



-317 -637 -951 -1274 



A 317 320 326 



320 314 323 



Reduced by -60. T =-587, P =+54. 



Eeduced by +60. T = - 643, P = 14. 



T 375 705 1043 1394 



-308 -642 -975 -1334 



P 61 74 93 118 



7 _5 - 24 - 55-5 



P-P 7 20 39 64 



- 14 - 19 - 38 - 69-5 



T-P314 631 950 1276 



-315 -637 -951 -12785 



A 317 319 326 



322 314 327-5 



Eeduced by -80. T = -820, P =27-5. 



Eeduced by +80. T =884, P =41-6. 



T 351 687 1034 1394 



-285 -623 -963 -1333 



P 38 55 82-5 118 



- 32 - 14 - 13 - 54 



P-P 10-5 27-5 55 90-5 



- 96 - 27-6 - 54-6 - 95-6 



T-P313 632 951-5 1276 



-317 -637 -950 -1279 



A 319 319-5 325-5 



320 313 329 



Eeduced by -100. T = -1068, P= -6-5. 



Eeduced by +100. T = 1 130, P = 76. 



T 326 671 1027 1397 



-255 -602 -948 -1333 



P 12 36 72 118 



59 32-2-57 



P-P 18-5 42 78-5 124-5 



- 79 - 44 - 78 - 127 



T-P314 635 955 1279 



-314 -634 -946 -1272 



A 321 320 324 



320 312 336 



Eeduced by +120. T=-1327, P= -51. 



Eeduced by +120. T =1393, P = 116. 



T 290 6 648 1013 1396 



-223 -585 -940 -1332 



P -21 17 62 115 



90 50 8 - 47 



P-P 30 68 133 166 



_26 - 66 -124 - 161 



T-P 312 631 950 1281 



-313 -636 -948 1284 



A 319 320 330 



323 312 336 



6. Results. — If, therefore, by determined forces ±W TO acting 

 in opposite directions, a wire is repeatedly twisted in alter- 

 nate senses, till the temporary and permanent torsions T± m 

 and P ±m attained by those forces are constant, and if the wire 

 be again twisted by increasing weights in the sense of the last 

 torsion, wherein its residual permanent torsion F p remains 

 constant, its transient torsions T^ — P^, reckoned from the 

 latter, increase nearly in proportion to the acting weights. 

 A very slight rise in the values of A is perceptible with the 

 greater torsions. 



If the permanent torsion P +m produced in a wire by the 

 weight W+ TO be reduced by a counteracting weight to a lower 

 value P ra within the limits P± m , and then the wire be again 

 twisted by increasing weights W(+), the permanent torsion 

 will gradually increase from P M to P+™. If this be subtracted 



