Page:Scientific Memoirs, Vol. 1 (1837).djvu/634

622 {|
 * rowspan=2 | || rowspan=2 | || colspan=4 |Angle of deviation. || rowspan =2 | Mean.
 * 1 ||| 2 ||| 3 ||| 4
 * rowspan= 5 |Copper and iron spirals ||| Copper spir. on the || rowspan=2| 17·3 || rowspan=2| 17·4 || rowspan=2| 17·6 || rowspan=2| 17·7 || rowspan=2| 17·500
 * armature
 * rowspan=2| Iron spirals ||| 17·3 ||| 17·6 ||| 17·5 ||| 17·9 ||| 17·575
 * 17·3 ||| 17·4 ||| 17·6 ||| 18·1 ||| 17·600
 * Copper spirals ||| 17·4 ||| 17·4 ||| 17·8 ||| 18·2 ||| 17·700
 * rowspan = 5 | Copper and platina spirals ||| Copper spir. on the || rowspan=2| 15·2 || rowspan=2| 15·4 || rowspan=2| 15·8 || rowspan=2|15·8 ||  rowspan=2|15·500
 * armature
 * rowspan=2|Platina spirals ||| 15·7 ||| 15·4 ||| 15·9 ||| 15·4 ||| 15·600
 * 15·7 ||| 15·4 ||| 15·8 ||| 15·4 ||| 15·575
 * Copper spirals ||| 15·4 ||| 15·8 ||| 15·3 ||| 15·9 ||| 15·600
 * rowspan=5 | Copper and brass spirals. ||| Brass spir. on the || rowspan=2|18·4 || rowspan=2| 18·3 || rowspan=2| 18·4 || rowspan=2|18·2 || rowspan=2|18·350
 * armature
 * rowspan=2|Copper spirals ||| 18·5 ||| 18·2 ||| 18·1 ||| 18·3 ||| 18·275
 * 18·4 ||| 18·2 ||| 18·5 ||| 18·4 ||| 18·375
 * Brass spirals ||| 18·4 ||| 18·3 ||| 18·3 ||| 18·3 ||| 18·325
 * }
 * armature
 * rowspan=2|Platina spirals ||| 15·7 ||| 15·4 ||| 15·9 ||| 15·4 ||| 15·600
 * 15·7 ||| 15·4 ||| 15·8 ||| 15·4 ||| 15·575
 * Copper spirals ||| 15·4 ||| 15·8 ||| 15·3 ||| 15·9 ||| 15·600
 * rowspan=5 | Copper and brass spirals. ||| Brass spir. on the || rowspan=2|18·4 || rowspan=2| 18·3 || rowspan=2| 18·4 || rowspan=2|18·2 || rowspan=2|18·350
 * armature
 * rowspan=2|Copper spirals ||| 18·5 ||| 18·2 ||| 18·1 ||| 18·3 ||| 18·275
 * 18·4 ||| 18·2 ||| 18·5 ||| 18·4 ||| 18·375
 * Brass spirals ||| 18·4 ||| 18·3 ||| 18·3 ||| 18·3 ||| 18·325
 * }
 * armature
 * rowspan=2|Copper spirals ||| 18·5 ||| 18·2 ||| 18·1 ||| 18·3 ||| 18·275
 * 18·4 ||| 18·2 ||| 18·5 ||| 18·4 ||| 18·375
 * Brass spirals ||| 18·4 ||| 18·3 ||| 18·3 ||| 18·3 ||| 18·325
 * }
 * 18·4 ||| 18·2 ||| 18·5 ||| 18·4 ||| 18·375
 * Brass spirals ||| 18·4 ||| 18·3 ||| 18·3 ||| 18·3 ||| 18·325
 * }
 * }

If we now combine the single means together and convert the decimals of the degrees into minutes, we obtain from this table the following results:

Since in this case the resistances remain the same for every pair of observations, our chief equation (A.) gives, when treated as before, the following proportions of the electromotive powers, if we designate them for copper, iron, platina, and brass with $$x,\, x',\, x,\, x'$$:

These three proportions are all of them so near to unity that there will exist no doubt as to the fact, that wires of copper, iron, platina, and brass suffer one and the same electromotive action; and that I may be allowed to extend the same position by analogy, even to all other metals and substances in general, until direct experiments shall have left the matter beyond all doubt. We shall have therefore the law,

"that the electromotive power which the magnet produces in spirals