Selenium cells : $b the construction, care and use of selenium cells with special reference to the Fritts cell

The opening chapters trace selenium’s discovery and its curious place between sulfur and tellurium, offering a concise history that grounds the reader in the element’s chemistry and natural occurrences. Clear explanations of its three physical forms—amorphous, vitreous, and metallic—help newcomers grasp why selenium behaves both as an insulator and, under certain conditions, as a conductor.

Building on that foundation, the author shares hands‑on guidance for constructing and maintaining selenium cells, focusing especially on the Fritts design. Detailed illustrations accompany step‑by‑step instructions for assembling the hot press, applying selenium layers, and wiring the testing apparatus. Along the way, practical tips and notes on common pitfalls empower experimentalists to achieve reliable results, while suggestions for further refinements invite readers to explore the field’s ongoing possibilities.