474 



approached by Rudbero: and ot: approximations I 



eutectic salt alloys have not been unknown. Thus M. 

 Maumene ( Ccmpte* Rend> iiL p. 1215) makes the 



very interesting statement that while neither nitrate of barium 

 nor nitrate of lead can be fused per *e without decomposition, 

 they can both be so fused beneath a mass of nitrate of potas- 

 sium or nitrate of sodium or a mixture of both. He stales 

 that an equivalent mixture of the nitrates of barium and 

 sodium melt* at about nd that when equal weights are 



tak allization begins a: -- ^nd solidification takes 



pLa .•_. according to M. Maumene, equal 



we:. i of lead and sodium have a melting- 



poi t 282° [we have seen that the eute 



alloy of the-e two fas^- 2G8P rA cont - wr cent. 



of nitrate of lea 221)]. And again. M. Maumene. on 



taking equal w rrate of sodium r nitrate of potas- 



sium, and nitrate of lead, finds the melting-point 259°. [I 

 fin m - ng at lbtiF and containing 



■A nitrate of lead.] It appears that none of the propor- 

 tion by M. Maumene are those of the eutectic all 

 and tka: _ ::. vrinperatures of solidification which 

 he gives cannot be constant. 



m. — Nitrate of 

 sodium fuses a: nd we erhapg expect that 



m ould have k :han the corre- 



sponding nitre alio g xperiments show that 



this is by no means th 



— otained by the 

 method above described, t: ::c alloy of these two salts 



has the fusing-poir. _ >385 gnu 



were converted into neutral sulphates, having the joint weight 

 lis impli I grains nitre and 1*3792 gram 



nitr xlium ; or 



Melting-point. 



Nitrate of sodium . . . . . » ~, . 



Nitrate of potassium " -i 



For the specific gravity of this alloy. - 



- 

 salt alloy has a 



grams gmve 1*2955 g of lead, which corresponds 



to 1*4] _am nitrate of lead. 



:: 1.— .-I- --"- 



Nitrate of sodium . . j 9ft ^o 



rate of lead . . . 42*84/ 



— - . nrider for a moment 



