______________
/ sum((p/g) r²)
O = / -------------
\/ C
[TEX: O = \sqrt{\frac{\sum \frac{p}{g} r^2}{C}}]
In M. Baillie's experiments, O = 437³, and sum(pr²)= 32171.6 (centimeter
grammes), the needle having been constructed of a geometrical form.
The following numbers represent the potential of an element of the
battery--that is to say, the quantity of electricity that the pole of that
battery spreads upon a sphere of one centimeter radius. They are expressed
in units of electricity, the unit being the quantity of electricity which,
acting upon a similar unit at a distance of one centimeter, produces a
repulsion equal to one gramme:
Volta pile 0.03415 open circuit.
Zinc, sulphate of copper, copper 0.02997 "
Zinc, acidulated water, copper, sulphate of copper 0.03709 "
Zinc, salt water, carbon peroxide of manganese 0.05282 "
Zinc, salt water, platinum, chloride of platinum 0.05027 "
Zinc, acidulated water, carbon nitric acid 0.06285 "
These results were obtained just upon charging the batteries, and are,
therefore, slightly higher than the potentials given after the batteries
became older. The sulphate of copper cells kept about their maximum value
longest, but they showed variations of about 10 per cent.
* * * * *