On the Heating Effects of Electric Currents. 



289 



Metal. 



Tin 



Platinum - silver 



alloy 

 Platinum foil. . . 

 „ ... 



)■> • • ■ 



Aluminium foil . 



Silver foil 



Pure silver wire. 



Zinc foil 



Copper wire. . . . 

 Brass wire 



Hard-drawn bright 

 steel wire 



Mercurv 



Gauge. 



inches. 

 '0185 



0-136 



136 



(repeated) 



0G4 



061 



0-001 thick 

 0-001 thick, 

 •0 512 -wide 



-00025 thick, 



1 in. wide 

 0-001 thick 

 '004 thick, 

 t in. wide 



-001 thick, 



1 in. wide 



-001 thick, 

 -f^ in. wide. 

 0"0j7 



-003 thick, 

 x in. wide 

 -003 thick, 

 i; in. wide 

 2 strips 

 No. 20 B/W.G-. 



Xo. 18 B.W.CK 



Xo. 18 B.W.Ct. 



Fused with a sharp report, and scat- 

 tered molten particles quite 6 feet in 

 all directions. 



Fuse produced little more than a large 

 splay of metal. 



This wire was enclosed in a porcelain 

 box covered by a glass plate. It fu?ed 

 with considerable flame. The glass 

 was broken into fragments, and the 

 porcelain box chipped. Some fiery 

 particles were thrown about. 



One inch of wire was put into an 

 earthenware box. When fused, the 

 particles of metal were securely im- 

 prisoned by the box to which they 

 adhered. All the lead was resolved 

 into globules. 

 I Molten particles were shot a distance of 

 ! 9 feet, 



, Molten particles thrown about 4 feet. 



This strip of foil was li in. long. Sparks 

 > thrown a few inches only. 



Molten particle* scattered about 9 feet. 



Incandescing particles thrown upwnrds 

 ! and around, but not more than 3 feet 

 | distant. 



Profuse particles, and some thrown 6 

 feet distant in a white hot" state, 

 i Xot so much splaying as in last experi- 

 ment. 



i Xq incandescent particles reached the 

 ground. The wire was destroyed 

 with a sharp report. 

 Better than silver foil, no particles 



being scattered. 

 A few particles were shot about 4 feet; 

 i one was of considerable size. 



Large incandescent globules scattered 

 around for a distance of 4 or 5 feet, 



This went off with a Hash, and threw 

 to a short distance a splay of metal 

 which remained incandescent for some 

 moments, and burnt a hole in t he 

 table. 



Scintillating particles flew in all direc- 

 tions to a great distance. This was 

 the most dangerous break of all the 

 experiments. 



Considerable flame produced, and par- 

 ticles widelv scattered. 



