﻿186 C. Barus and V. Strouhal — Strain-effect of sudden 



Table II.— Resistance of consecutive cores and shells of hard steel rods. 



Eod No. 



Shell or 

 Core No. 



W t 



So 



R 



& 



So 



11 



o 



660 



41-4 











1 



820 



44-1 



0-31 



0-024 



31 





2 



1000 



44-0 



•28 



32 



46 





3 



1290 



43-2 



•24 



35 



45 





4 



2250 



43-3 



•20 



60 



43 





5 



4130 



46-3 



•15 



37 



39 





6 



6620 



46'6 



•12 



27 



46 





7 



16040 



52-8 



•09 



33 



42 



12 







680 



41-8 











1 



820 



42'6 



0-31 



0-021 



37 





2 



1020 



42-7 



•28 



34 



43 





3 



1300 



44-3 



•25 



27 



37 





4 



2440 



46-0 



•21 



54 



42 





5 



3390 



45-7 



•16 



34 



47 





6 



5400 



44-4 



•13 



34 



47 





7 



10730 



57-4 



•10 



26 



34 





8 



22640 



50-8 



•07 



29 



49 



13 







660 



40-4 











1 



730 



42-0 



0~31 



0-014 



30 





2 



800 



42-4 



•30 



16 



38 





3 



910 



43-0 



•28 



20 



39 





4 



1310 



43-7 



•24 



44 



41 





5 



2110 



44-0 



•20 



44 



43 





6 



3200 



45-8 



•16 



30 



41 





7 



8330 



47-0 



•12 



57 



45 



14 







680 



41-4 











1 



740 



42-0 



0~3i 



0-013 



36 





2 



1090 



54-8 



... - 



_ _ _ _ 







3 



960 



42-7 



•29 



•035 



39 





4 



1360 



41-9 



•25 



42 



45 





5 



1990 



44-7 



•21 



38 



36 





6 



2930 



47-0 



•17 



31 



40 





7 



5710 



42-9 



•13 



52 



51 





8 



21280 



53-9 



•08 



44 



39 



along any radius do not perceptibly diminish. It was this 

 curious result, apparently adverse to the hypothesis of strain, 

 which induced us to examine the corresponding behavior of 

 quenched glass. 



The diameters 2p of P. K. drops, Nos. 3, 5, were successively 

 reduced* as follows : 



2p = 0*79 0*75 0-72 0'69 0*62 0*56 cm., 

 and 2p = 0*82 0*79 0*75 0'72 0*65 0'59 cm. 



The polarization figure, drawn after each of these reductions, 

 retained a uniform character throughout and showed no further 

 loss of delicacy of demarcation and color than could be re- 



* We desisted from further reduction of diameter because of the invasion of 

 bubbles. 



