1887.] On the Heating Effects of Electric Currents. 285 



Platinoid. 



Diameter of wire. 



Current in amperes. 



Fusing 

 current 

 calculated 

 from the 

 formula 

 ad 312 . 



Amperes. 



Constant 

 "a" 



when d 

 expressed 

 in inches. 



In 

 inches. 



In 

 centi- 

 metres. 



Standard 

 wire 

 gauge, 

 No. 



Shellac 



flake 

 melted. 



Wire 

 red hot. 

 Visible 

 in air. 



Wire 

 fused. 



0-007 



0-018 



37 



1 -609 



2-092 



3-218 



3 223 



5491 -8 



o-oio 



0-025 



33 



2-414 



3-379 



5-551 



5-503 



5195 -1 



0-012 



0-030 



30 



2-655 



4-666 



6-998 



6*820 



5325-1 



0-014 



0-036 



28 



3-540 



5-108 



8-368 



8-590 



5045 -9 



0-018 



0-046 



26 



4-626 



8-042 



12-230 



12 -530 



5062 -5 



0-020 



-051 



25 



6-636 



9-604 



14 '480 



14-680 



5116-6 



-027 



0-069 



22 



9-253 



13 -275 



23 -332 



23 -020 



5256 2 



0-035 



0-089 



20 



11-263 



18 -502 



32 -986 



33 200 



5035 3 















Mean = 



5191-1 



Iron. 



Diameter of wire. 



Current in amperes. 



Fusing 

 current 

 calculated 

 from the 

 formula 

 ad 3 ' 2 . 



Amperes. 



Constant 



"a" 

 when d 

 expressed 

 in inches. 



. Tn 

 inches. 



In 

 centi- 

 metres. 



Standard 

 wire 

 gauge 

 No. 



Shellac 



flake 

 melted. 



Wire 

 red hot. 

 Visible 

 in air. 



Wire 

 fused. 



0-007 



0-018 



37 



1-101 



1-713 



1-998 



1 930 



3410 -3 



o-oio 



0-025 



33 



2-121 



2-896 



3 -486 



3-435 



3460 -7 



0-012 



0-030 



30 



2-406 



3 425 



3-996 



4 320 



3038-8 



•0-014 



0-036 



28 



3-467 



4-364 



5-506 



5-450 



3326 -5 



0-018 



-016 



26 



3915 



6 200 



7-750 



7 -950 



3208 -4 



020 



0-1-51 



25 



5-028 



6-758 



9-012 



9-310 



3180 9 



0-026 



0-066 



22 



6*362 



11-500 



13 212 



13 -800 



3148 -4 



0-030 



0-076 



21 



8-483 



14-843 



17 292 



17-100 



3326-1 



0-036 



0-091 



20 



13 -702 



22 -510 



24-145 



22 500 



3533-2 















Mean = 



3292-6 



