﻿Cooling exhibited by Glass and by Steel. 



189 



Table Y, constructed on the plan described for Tables III 

 and IV, contains results for the variation of density along the 

 transverse axis of drops annealed in boiling sulphur, 450°. 

 Polariscopic examination showed these drops to be free from 

 strain. 





Table V.- 



—Structure of P. B. Drops annealed at 450°. 





No. 



Diameter. 



M 



A„ 



V 



# 



6 



B 



lo 

 1 8 



cm 



0-767 

 0-710 



0-688 



l-l g 662 

 0-8897 

 0-7859 



2-4398 

 2-4242 

 2-4147 



s 



0-2765 

 0-1038 



cm 

 0-028 



o-oii 



2-491 

 2-503 



cm 



0-369 

 0-350 



2o 

 2 4 



0932 

 0-874 

 0-832 



1-8913 

 1-4790 

 1-3118 



2-4420 

 44303 

 2-4231 



0-4123 

 0-1673 



0-029 

 0-021 



2-484 

 2-484 



0-451 

 0-426 



60 

 61 

 6 2 



0-795 



0-740 

 0-710 



1-2048 

 0-9329 

 0-8436 



2-4468 

 24350 



2-4284 



.0-2719 

 0-0893 



0-027 

 0-015 



2-488 

 2-504 



0-384 

 0-362 



In Table YI, finally, we give the results for the P. E. drops, 

 Nos. 10 and 11. The first two shells were removed from the 

 drops while in the original (quenched) state. Both were then 

 annealed for two hours at 450° and a further removal of shells 

 effected. The numbers referring to the annealed state are 

 primed. In other respects the notation is that of the preced- 

 ing tables. 







Table VI.— Structure of P. 



R. Drops. 



No. 



Diam. 



M 



A 



V< 



# 



<5 



B 



Remarks. 





cm 



g 





g 



cm 





cm 





10 n 







1-2984 



2-4346 















j- Quenched. 



10, 



0-761 



1-0766 



2-4269 



0-2218 



(0-02) 



2-473 



(0-39) 



10, 



0-717 



0-9014 



2-4166 



0-1732 



0-022 



2-481 



0-370 



10% 



0-716 



0-9014 



2-4263 











) 



10% 



0-676 



0-7425 



2-4136 



0-1589 



0-020 



2-488 



0-348 



)■ Annealed, 450°, 2 h . 



10% 



0-637 



0-6132 



2-3982 



0-1292 



0-020 



2-490 



0-328 



) 



Hn 





1-0463 



2-4357 











) 



Hi 



0-719 



08555 



2-4281 



0-1909 



(0-02) 



2-471 



(0-37) 



V Quenched. 



11, 



0-680 



0-7173 



2-4148 



0-1382 



0-020 



2-500 



0-350 



) 



11% 



0-680 



0-7173 



2-4261 







. 







) 



11' 3 



0-635 



0-5823 



2-4086 



0-1348 



0-023 



2-505 



0-329 



Y Annealed, 450°, 2\ 



11% 



0-590 



0-4678 



2-3919 



0-1148 



0-023 



2-479 



0-306 



) 



Discussion. — An inspection of Tables III and IY shows at 

 once that J , the density of consecutive cores continually de- 

 creases. This is easily accounted for since the bubble error 

 becomes relatively large as the mass, M, of the P. E. drop, 

 decreases. 



