Metal, 
Platina Rod, 18 } 
inches long, 
4 diam. 
Bar 7 inches r 
4, weight 565 
grains, 
Foil 30 grains- ae 
Palladium 35 
grains, 
iSitver Bar 7 >) er Bar 7 
inches by i} 
wt, 300 grs 
Silver wire ;',. 
Ditto .3,. 
Mercury in 
glass tube, 6 
inches by 4. 
Professor CuMMING on the Developement 
TABLE II. 
Deviations observed with the small Compass neutralized. 
Brass bar*, 17 
inches by 5 
and + 
J 
Wire. Dev. | Heat. 
: < Spirit 
Silver. 70 pos, tinea 
Brass. 60 pos.| Ditto. 
Silver. 70 pos. Ditto. 
Copper. 70 pos.| Ditto. 
Silver. 70 pos.| Ditto. 
Platina. 4 neg. | Ditto. 
Silver 70 pos ; Sue 
; ‘| Clamp. 
Platina. 20 neg.| Ditto. 
: E Spirit 
Platina. 50 neg. ; lamp. 
Silver. 35 pos.| Ditto. 
Copper #5. |10 neg.| Ditto. 
Ditto 35. 10 pos.} Ditto. 
16 pos.| 170° 
Copper. 12 pos.| 150 
6 pos.| 115 
— : Spirit 
Silver, 60 pos. ha 
Silver and Pla- 
tina, Silver in 4/40 pos.| Ditto. 
contact, 
Ditto a 20 neg,| Ditto, 
in contact. 
Ditto Platina of 
Z inch in con-¢} 35 pos.| Ditto. 
tact. 
Platina, 20 neg.| Ditto. 
Copper. 35 pos.| Ditto. 
Zinc. 65 pos.| Ditto. 
Brass. 45 pos.| Ditto. 
Metal t. Wire. | Dev, Heat. 
Copper. Copper.| 16 pos.| Spirit lamp, 
Platina. 18 neg. Ditto. 
Silver. | 40 pos. Ditto. 
Zinc. | 30 pos. Ditto. 
Zinc. Zinc. | 4pos. | Spirit lamp. 
Iron. | 6 pos. Ditto. 
Silver. | 4 pos. Ditto. 
Copper.|45 neg. Ditto. 
Platina./50 neg. Ditto. 
Tin. Copper.| 10 pos.| Solder melted. 
Zinc. | 27 pos. Ditto. 
Lead. Copper. 25 pos.| Solder melted. 
Iron. Copper.|45 neg.| Spirit lamp. 
Tron. | p——| 2 Ditto. 
Brass. |40 neg.| Solder melted. 
Nickel impure, |Copper-.| 35 pos.| Solder melted. 
Pewter. Copper.| 25 pos. melted. 
Plumber's solder. | Ditto, | 24 pos. Ditto, 
Printer’s type. | Ditto, (32 neg.) Spirit lamp. 
Fusible metal. Ditto, | 5 neg. melted, 
Ditto Arsenic $, | Ditto, |20 neg, Ditto. 
1do.41Type metal.| Ditto, |60 neg. Ditto. 
1 Bismutli+-1 Tin. | Ditto, |60 neg.) Solder melted. 
Antimony+Tin . | Ditto, | 8 pos. Ditto. 
1Zinc+1Tin, | Ditto. |22 neg. Ditto, 
1 Zinc+1 Lead. | Ditto. |40 neg. Ditto, 
Zinc+ Antimony ¢.| Ditto. |50 neg. Ditto, 
Copper-+ Zine+ : : 
Tin, magnetic. Ditto, |10 pos. Ditto. 
* The deviation was not affected by heating either the middle of the bar, or of the silver 
wire by another spirit lamp at the same time. 
+ The metals in this column were square bars 6 inches long by 
{ Proportions uncertain, 
3 inch, 
