366 
ME.  CEACE  CALVEET  AKD  I^IE.  E.  JOHXSOA’  OS  THE  EELATITE 
Alloys  of  Antimony  and  Lead. 
Owing  no  doubt  to  the  slight  difference  of  the  conductibility  of  these  two  metals, 
Antimony  being  . . 6 ‘12 
Lead 9'17 
the  influence  of  excess  of  equivalents  of  lead  over  those  of  antimony  is  not  so  striking 
in  this  series  as  in  the  preceding  one.  The  following  are  the  results  obseiwed: — 
Alloys  of  Zinc  and  Copper. 
The  reason  why  we  have  kept  these  alloys  all  together,  and  have  not  di^ided  them  so 
as  to  bring  them  under  the  last  two  divisions,  is,  that  they  have  a tendency  to  come 
entirely  under  the  last  division.  We  say  a tendency,  for  they  do  not  offer  the  distinctive 
degrees  of  conductibility  that  the  alloys  of  copper  and  tm  or  bismuth  and  antimony  pre- 
sent ; but  this  may  be  due  to  the  conducting  powers  of  copper  and  zmc  being  within  a 
few  degrees  of  one  another. 
Cast  Copper  being  . 25'87 
Cast  Zinc  ....  20‘03. 
Conductibility  of  Copper  and  Zinc  AUoys. 
Obtained. 
Calculated. 
Silver = 
= 1000. 
Obtained. 
Calculated. 
Cu  = 49'32'l 
Zn  = 50’68 
> 
21-95 
22-92 
688 
CO 
Cu  = 32-74 
2Zn  = 67*26  j 
13-65 
21-91 
428 
CO 
Cu=24-64  ■ 
3Zn=::75-36j 
16-95 
21-44 
531 
672 
Cu=  19-57 
4Zn  = 80-43J 
18-80 
21-14 
589 
663 
Cu  = 16-30 
5Zn  = 83-70 
19-00 
20-95 
595 
657 
