92 The Spectroscope in Mint Assaying. (| January’ 
Table A. 
at 2. 3. 4. BS 
*Upper Pole .. Gold 16°6 159 0'7 1-4286 I-277000 
Lower =, a as 16'7 16°0 o'7 a Fe 
Upper ,, re Copper 18°5 18°4 ol I-30000 I-194.0000 
Lower ” ee ” ” ” ol ” ” 
Wipper an, .. Gold Ingot 24:0 234 06 I-5000 I-324000 
Lower %” 29 29 ” ” 06 ” Lad 
Wippenies: ce itt 20°0 19'6 04 I-7500 1-486000 
Lower ,, 50 39 30 1Q'4 0'6 I-5000 I-324000 
Upper ,, Sven 24'8 24°6 0-2 I-15000 I-976000 
Lower ,, 30 s 25°1 25°0 Ox: I-300C0 1-1940000 
WAVeragcmucs scr wlazead 1'6 go'o 16 1-1870 I-I21000 
Table B. 
Wpper Pole =. (Gold 20'5 20°0 0'5 1-6000 I-388000 
Lower  ,, a Copper 10'0 9:9 o'r I-30000 I-I1940000 
Wipperen, .. Gold Ingot 21‘o 20°4 o'6 I-5000 I-324000 
Lower ,, .. Copper 20°2 20°0 072 I-15000 I-976000 
Upper ,, .. Silver 6'0 58 o'2 I-15000 a 
TZ OWiCT) is. ein 20°0 19°4 06 I-5000 I-324000 
tUpper .,, Se Nickel 12'0 II‘95 0°05  I-60000 I-3880000 
Lower ,, on 12°0 II'g o'r I-30000 I-1940000 
* The upper pole usually formed the positive electrode. 
+ The average of lead is given because the results varied in different 
experiments. 
t The minimum of metallic nickel producing a spectrum according to 
Cappel’s tables is one six-hundredth of a milligramme. 
