as a Standard of Electrical Resistance. 109 
No. 5. Made and drawn in Frankfort. Procured through my 
friend Dr. Dupré. These wires were annealed on a wire-gauze 
over a Bunsen’s glass-blower’s lamp. 
No. 6. Made of proof-gold and silver, by Messrs. Johnson 
and Matthey, of Hatton Garden, and drawn by them. These 
wires were annealed in the same manner as No. 2. 
No. 7. Made and drawn by myself, of proof-gold and silver, 
lent me by Professor Hofmann. Annealed in the same manner 
as No. 2. 
No. 8. Made and drawn by myself, of pure gold and silver. 
Annealed as No. 2 was. 
In Table I. are given the values found for conducting power 
of the above alloys. ‘They have been compared with a hard- 
drawn silver wire, whose conducting power has been taken 
= 100 at 0° C. 
Table I. 
No. of alloy. Mean reduced to 0° C. 
Oe Hard-drawn. Temp. Annealed. Temp. Hard-drawn. Annealed. 
0. 1. vs 
BUA cose nea caiines . 1499 145C. 15:02 15-0C. 
PERIOD civewiv savas 14°87 15:0 14:92 15:2 15:08 15°13 
Mean ..... wee Slee  ~ Lares 1497" tart 
No. 2. 
PARE oe elena e 14:98 9°8 15:02 10°0 
meme. sisi. 14:95 9°6 1504 10°4 15°06 15°14 
RICAN vceacesie  L4°96 9°7 15-03 10°2 
No. 3. 
Ro ae ed 14:60 16°8 14°66 17:0 
ae a a Bere BAST Dx. LOD 14-82 17-4 14°85 14°92 
RTCAD. .s.000 14°68 16°5 4-74 17:2 
-No. 4 
1 wire Slidarciase eases : 14:94 6:0 
PEMUMEED? Aicrarnedtes eeu 15°02 9°8 Mn 15:06 
lean ‘id des Seeks 14°98 7 
No. 5 
i Wetbeers he... 15°02 8°5 15:06 9-0 
yp WATE) cite. isiciven 14°99 9°2 15°03 9°8 15:09 15°14 
WEAN -ciheceie’» ; 15°00 8°38 15°04 9°4 
No. 6 
BONWIEE) We Saccwoes ve 14°87 148 14:82 16-0 
PO WEROT Me Ursvde ss vice TAGS? NED 14:86 15°0 14:99 15°00 
1 a 14:83 16°0 14°84 15:5 
No.7 
Lac ere 14:94 14:0 14:99 16:2 
PERE. iva ociein Cas 14:91 16-2 1497 U2. 107 15°16 
UE one 14:92 © York 1498 167 
No. 8 
Eyres, Senter: i 14°86 18°4 14:92 18°2 
PURE oes oc anise 1488 166 14-90 17°70 15°05 15°10 
Mean.....00s ‘ IAS 1 1e'3 14°91 i 
Meanseseees 15°03=100 15:08=100°3 
