" The
above measurements were made in dark.
4. _Sensitiveness to change of battery power_.--My cells are extremely
sensitive to any change in the strength or character of the current
flowing through them, which is shown by a corresponding change in the
resistance of the cell. I can, therefore, vary the resistance of one of
my cells in many ways, and the following may be specified--
(a) By changing the potential or electromotive force of the current
through the cell.
(b) By changing the "quantity" of the battery or current.
(c) By putting more or less resistance in the circuit.
(d) By dividing the current, by one or more branch circuits or shunts
around the cell.
(e) By varying the resistance in any or all of said circuits.
A cell whose resistance becomes greater as the battery power becomes
greater, and _vice versa_, I call an "L B cell" signifying _Like the
Battery power_. A "U B cell" is one whose resistance becomes greater as
the battery power (or strength of current) becomes less, and _vice
versa_, being _Unlike the Battery power_, or current strength.
These changes of resistance are not due to heating of the conductor or
the selenium, and the following instance will illustrate this.
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