446 C. Barm and V. Strouhal — Strain-effect of sudden 



No. 



Temper. 



in. 



A„ 



Remarks. 



8 



Quenched 



1-0025 



24395 



Bubbles. Color. 





Annealed, 360°, 30 m 



1-0025 



2-4444 



Do. 





(Mercury.) 











Annealed, 360°, 3 h _. 



1-0023 



2-4482 



Do. 





(Mercury.) 











Annealed, 450°, l h 



1-0023 



2-4526 



Do. 





(Sulphur.) 











Annealed. 450°, 4 h ._„. 



1-0023 



24586 



Do. 





(Sulphur.) 











Annealed, red heat 



0.9982 



2-4901 



Bubbles and color gone. 

 Form partially changed. 

 Cooled slowly. 



9 



Quenched 



1-2759 



2-4365 



Bubbles. Color. 





Annealed, 360°, 30 m 



1-2745 



2-4423 



Do. 





(Mercury.) 











Annealed, 360°, 3 h 



1-2745 



2-4436 



Do. 





Annealed, 450°. l ll _ 



1-2745 



2-4472 



Do. 





Annealed, 450°, 4 h 



1-2727 



2-4510 



Dor 





Annealed, red heat 



1-1592 



2-4929 



Bubbles and color gone. 

 Form partially changed. 

 Cooled slowly. 



Table III. — Density of Prince Rupert's Drops, Quenched and Annealed. 



Digest. 





Hard. 



" Soft." 



Density-increment relative to ' 



' soft," when annealed at 



No. 



A . 



A„. 



20° 



200° 



360° 



450° 



(550°) 



(650°) 



Red heat. 









-o-o 



-o-o 



-o-o 



—o-o 



-o-o 



-o-o 





1 



2-4345 



2-4915 



229 





207 







006 



—0-0002 



2 



2-4364 



2-4912 



222 







202 







004 



— 0-0000' 



3 



2-4374 





216 



220 



201 















4 



2 4356 





223 



225 



212 

















5 



2-4349 



2-4914 



227 



223 



206 



188 



154 





-o-oooi 



6 



2-4323 



2-4893 



229 



225 



205 



189 



144 





+ 0-0007 



7 



2-4395 





207 























8 



2-4395 



2-4901 



203 







j 184 

 / 168 



\ 150 

 I 127 











+ 0-0004 



















9 



2-4365 



2-4929 



227 





j 203 



I 198 



j 184 











-0-0007 













} 168 









