The activity of ions at the electrode surface changes when there is current flow, and there are additional overpotential and resistive loss terms which contribute to the measured potential.
Despite this success, the magazine had a reputation for low-quality space opera and adventure fiction, and modern literary historians refer to it in dismissive terms.
They are tightly and economically composed and in terms of color, which he deploys judiciously, absolutely spot-on technique as far as nature is concerned.