288 Profs. Dewar and Fleming on the Electrical 



§ 12. VI. Aluminium. 



We were provided with numerous samples of aluminium 

 by the kindness of Mr. Gr. Addenbrooke, and also with a 

 solder which enabled us, without difficulty, to attach these 

 wires to the copper terminals. This aluminium was prepared 

 at Neuhausen. One sample was the ordinary Commercial 

 Aluminium which contained 97*5 per cent, of aluminium, and 

 another was a purer kind containing 99 per cent.^ of 

 aluminium. These we refer to as the Commercial Aluminium 

 and Neuhausen Aluminium. A third sample was obtained 

 from Messrs. Johnson and Matthey. For the first two 

 samples the results of observation were as follows : — 



Neuhausen Aluminium, 99 per cent., fine. 



Length=200 centim. Mean diameter = 0*024446 centim. 

 Mean sectional area = 0*00046936 sq. centim. 



Commercial Aluminium, 97 '5 per cent., fine. 



Length = 99*8 centim. Mean diameter =0*024520 centim. 

 Mean sectional area= 0*00047221 sq. centim. 



L rWsec^nl 3 . 6750() 



&U, L lengtn J 



Neuhausen Aluminium, 99 per cent. 



■Rt. 



t°. 



pt. 



pt. 



1-9699 



191-5 



4623 



188-6 



17523 



145-3 



4112-3 



143-9 



1-5217 



92-20 



3571-1 



92-3 



1-3293 



50-60 



3119-6 



51-20 



1-1813 



18-70 



2772-3 



19-10 



1-1536 



12-80 



2707-3 



1310 



1-1007 



105 



2583-1 



1-05 



0-8967 





2104-4 



- 43-8 



0-7339 





1704-2 



- 81-9 



0-2461 





559-7 



-197-1 



Volume-specific resistance at 0° C. . =2563 C.Gr.S. units. 

 Mean temperature-coefficient between 



0°C. and 100° C ='00423. 



