The best way of obtaining this gas free from mixture is, by decomposing water with very pure soft iron, as directed in exp.
How does the strength of the current compare with that of exp.
For the same reasons, when an internal bright object was small, as in exp.
Look steadily, for a short time, at a window in a dark day, as in exp.
As y tends towards ∞, exp y tends towards ∞ more rapidly than any power of y.
A hard steel sewing-needle (No. 1); other articles used in exp.
To be sure that you understand and remember what was learned in exp.
(C) Make a sketch of the resulting figure, and compare it with the figure made in exp.
(B) With the compass test the polarity of the cores as in exp.
Do lines of force curve over B M as well as around its sides, as shown in exp.