Cooling exhibited by Glass and by Steel. 



445 



Table II. — Tamper, weight and density of quenched glass (Prince 

 Rupert's drops), successively annealed. 



JSo. 



Temper. 



TO. 



A 



Remarks. 



1 



Quenched . 



a. 



1-3500 



2-4345 



Bubbles. Color. 





Annealed, 360°, 30 m .. 



1-3500 



2-4401 



Do. 





(Mercury.) 











Annealed (650°), 10 m _ 



1-3497 



2-4901 



Bubbles and color vanish. 

 Form of drop not changed. 

 Cooled slowly. 





Annealed, red heat 



1-3470 



2-4910 



Cooled slowly. 





Annealed, red heat 



1-3311 



2-48.83 



Cooled in air, from intense 

 redness. 





Annealed, red heat 



1-3312 



2-4915 



Cooled slowly. 



2 



Quenched . 



1-3200 



24364 



Bubbles. Color. 





Annealed, 360°, 30 m _ 



1-3200 



2-4408 



Do. 





(Mercury.) 











Annealed (650°), 10 m 



1-3191 



2-4903 



Bubbles and color vanish. 

 Form of drop not changed. 

 Cooled slowly. 





Annealed, red heat 



1-3172 



2-4912 



Cooled slowly. 



3. 



Quenched 



1-4590 



2-4374 



Bubbles. Color. 





Annealed, 200°, 15 m .__ ... 



1-4591 



2-4364 



Do. 





(Paraffine.) 











Annealed, 360°, 30 m 



1-4590 



2.4411 



Do. 





(MeFcury.) 









4 



Quenched 



1-3305 



2-4356 



Bubbles. Color. 





Annealed, 200°, 15 m 



1-3305 



2-4351 



Do. 





(Paraffine.) 











Annealed, 360°, 3 m 



1-3292 



2-4383 



Do. 



5 



Quenched 



1-3009 

 1-3009 



2-4349 

 24359 



Bubbles. Color. 





Annealed,* 200° 1> 30 m 



Do. 





(Camphor.) 











Annealed, 360°, \ h .. 



1-3010 



24402 



Do. 





(Mercury.) 











Annealed, 450°, 30 m 



1-3012 



2-4446 



Do. 





(Sulphur.) 











Annealed (550°), 10 m 



1-2983 



2-4531 



Color vanishes. Cooled 

 slowly. 





Annealed, red heat 



1-2982 



2-4914 



Bubbles gone. Form partially 











changed. 



6 



Quenched 



1-4409 



24323 



Bubbles. Color. 





Annealed,* 200°, l h 30 m 



1-4409 



24333 



Do. 





(Camphor.) 











Annealed. 360°, l h 



1-4409 



2-4382 



Do. 





(Mercury.) 











Annealed, 450°, 30 m 



1-4412 



24422 



Do. 





(Sulphur.) 











Anuealed (550°), 10 m 



1-4410 



2 4534 



Color vanishes. Cooled 

 slowly. 





Annealed, red heat 



1-4408 



2-4893 



Bubbles gone. Form partially 











changed. Slow cooling. 



7 



Quenched 



1-4795 



2-4395 



Bubbles. Color. 



* An explosion of the camphor vapor may have slightly raised these values, 

 hut we believe them to be correct. 



