Capillarity of Molten Bodies. 



91 



by a second platinum wire. By trial, the quantity of salt was 

 determined which was just carried by the lower end of the ver- 

 tical wire, or which just fell off when it was a little too heavy 

 or when the temperature was too high. A horizontal wire 

 carries a larger drop than a vertical one in the same circum- 

 stances, in consequence of the longer line of contact. 



In many cases, the bead ascends on the vertical wire, because 

 it cools from the top downwards ; and the meniscus always tends 

 towards the position where the capillarity-constant a of the molten 

 salt has its greatest value. 



The beads of salts which fell off were taken up on a piece of 

 platinum-foil and weighed, in the case of hygroscopic salts, be- 

 tween two watch-glasses. The measurements given below are 

 the means of the drops of the salt which fell off, and of those 

 which still adhered to the platinum wire. 



2r. 



Boracic acid. 



Borax. 



Phosphorus-salt. 



W. 



a. 



W. 



a. 



W. 



a. 



millim. 

 0-5569 

 0-3974 

 01808 



grm. 

 0-01982 

 0-0132 

 0-00577 



mgrms. 

 10-16 

 10-56 

 11 '33 



grm. 

 0-03653 

 0-0285 

 0-01198 



Mean 



m^rms. 

 20-88 

 22-83 

 21-08 



21-60 



grm. 

 0-0367 

 002472 

 0-01188 



mgrms. 

 20-98 

 19-81 

 20-91 



Mean 



10-69 



Mean 



20-57 





Carbonate of 

 potash. 



Carbonate of soda. 



Chloride of 

 calcium. 



0-5569 

 0-3974 

 0-1808 



0-0278 



0-02097 



0-0093 



16-38 

 16-79 

 15-89 



00341 1949 

 0-02888 23-14 

 00115 20-25 



0-02686 

 001843 

 000898 



15-36 

 14-77 

 15-81 



Mean 



1633 



Mean 



20 96 



Mean 



15-31 



0-5569 

 0-3974 



0-1808 



Chloride of 

 potassium. 



Chloride of 

 sodium. 



Chloride of 

 lithium. 



001611 

 0-01203 

 000551 



9-208 

 9-636 

 9-703 



00196 

 I 001392 

 : 000712 



11-20 

 1115 

 12-54 



002137 

 001523 

 00067 



12-22 

 12-20 

 1180 





Mean 



9-516 



Mean 



11-63 



Mean 



1207 



Nitrate of potash. 



Chloride of silver. 



2r. 



W. 



a. 



2r. 



W. 



«. 



millim. 



0-5569 

 0-3974 



0-1808 



grm. 

 00170 

 0-0130 

 0-00553 



mgrms. 

 9-716 

 10-41 

 9-763 



millim. 

 0530 

 0-265 



grm. 

 0-031 5 

 00159 



mgrms. 

 18-92 

 19-11 



Mean 1 9-954 



! 



1 



Mean 



1901 



