Melting-points of Aluminium, Silver., Gold, Coppei 



'C. 



47 



the exponential equation similarly fitted the Holborn and Wien 

 comparison of the rhodo-platinum couple with the air thermo- 

 meter within the same limits ; 3rd, that the exponential 

 equation diverged systematically, although slightly, from ths 

 Barus data, and the logarithmic from the Holborn and Wien 

 data, by about equal and opposite amounts both inside and 

 outside those limits, but much more markedly between 0° and 

 400° than at higher points. 



Table I. 

 Melting-points. 



1 











Tern pei 



atures. 







Date. 



Subst. 



micro- 































volts. 



Assumed 

 as Cor- 



From 

 Aven. 



From 

 Exp on. 



From 

 Log Eq. 



te + tl 



2 



Provis- 

 ional 



3-? 







rect. 



Eq. t a . 



Eq. t e . 



ti. 



Values. 



H,0 



885-8 



99°(U 













4-10 



HP 



890-4 



10057 

















■ 







o 



o 



c 



o 









888-1 



[100-10] 



87-4 



9L-7 



1073 



9y-5 





3-15 



O 10 H 8 



2213 



2183 













3-23 



O, H a 



2224 



218-9 













3-25 



C 10 H d 



2216 



218-2 

















2218 



[218-5] 



206-6 



211-4 



222-4 



216-9 





3-? 



S 



5287 



444-7 













3-22 



s 



5289 



445-2 













3-29 



s 



5287 

 5288 



444-5 



[444-8] 













4-24 



Cu 



16463 



— 



1095- 



1095-0 



1096-5 



1095-5 



1095 



4-29 



Au 



16002 



[1072] 



— 



— 



— 



— 



[1072] 



4-29 



Ag 



14093 



— 



975- 



972- 



969- 



970 5 



970 



5-2/3 



Pt 



30313 



— 



1695- 



1735- 



1783- 



1759- 



1760 



5-3 



Al 



"8638 



— 



665-5 



662-5 



656-2 



659-4 



660 



Aven. 4 6 =(^-^){ 9 ' 7335 + ' 0048i49 (^+^i)}- 

 Exp. 2je=0-3901 r W88 -1645. 

 Log. 2^=2-49655 t l ' 2bm . 



Inspection of columns 6 and 7, Table I., will show that the 

 computed boiling-points of water and napthalin by the ex- 

 ponential and logarithmic equations depart widely from the 

 known temperatures in opposite directions, by about equal 

 amounts, and in the directions according with the departures 

 from the Barus and Holborn and Wien data. Also, that the 

 differences between the computed melting-points intermediate 



