432 



melcher: change of density of sulphur 



breaking. In one end of the tube a closely fitting brass plug 

 about 0.4 inches long was soldered. Through this plug and the 

 tube a pin was soldered, in order that the plug might withstand 

 the pressure of the sulphur under rupture. 



The tube and plug were then weighed and placed in an electric 

 furnace and nearly filled with powdered sulphur. After the 

 sulphur had melted it was stirred to eliminate air bubbles. The 

 circuit was then broken and the sulphur allowed to crystallize. 

 In the center of the column of sulphur was found a depression 

 due to the fact that the density of sulphur increases on solidi- 

 fying and that it crystallizes fi"»'st on the sides of the tube. By 

 again melting the sulphur at the top or by adding more sulphur 

 and melting it, this depression was largely, if not wholly, elimi- 

 nated. Sometimes this process had to be repeated, working 

 gradually towards the top of the tube. 



TABLE 1 



II 



III 



IV 



VI 



Weight of sulphur, grams 



Vol. of sulphur, cc. (Density 

 = 1.9) 



Decrease in weight due to 

 bending 



Temperatures centigrade 



Density of water at above 

 temperatures 



Volume increase 



Vol. of sulphur after bending 



Density after bending 



Diminution in density -j- ini- 

 tial density 



62.0683 



32.67 



1.6311 

 23.4° 



0.99747+ 

 1.6352 

 34.3052 

 1.809 



0.048 



62.7628 



33.03 



1.6884 

 23.4° 



0.99747+ 

 1.6927 

 34.7227 

 1.807 



0.049 



64.8365 



34.12 



1.9286 

 23 4° 



42.3654 



22.30 



1.2434 

 27.3° 



0.99747+ , 0.99646 



1.9335 1.2478 



36.0535 23.5478 



1.798 1.799 



0.054 



0.053 



44.8448 



23.60 



1.7017 

 28 1° 



0.99624 

 1.7081 

 25.3081 



1.772 



0.067 



64.9445 



34.18 



1.9532 

 27.3° 



0.99646 

 1.9601 

 36.1401 

 1.797 



0.054 



After the sulphur column had been planed off the sample was 

 again weighed, in order to get the weight of sulphur. Another 

 closely fitting plug about 0.9 inches in length was then driven 

 down in the open end of the tube against the surface of the 

 sulphur and fastened by a pin and solder as in the previous case. 

 It might be mentioned that some difficulty was encountered in 

 soldering the plug and pin, due to the fact that sulphur melts 

 at about 114°C. and solder at about 300°C. This difficulty was 

 eliminated by using a large soldering iron and immersing the tube 

 in water close up to the place of soldering. 



