Scientific American Supplement, No. 821, September 26, 1891

"Scientific American Supplement, No. 821, September 26, 1891" by Various is a late 19th-century journal that presents a range of articles covering the scientific and technological innovations of the era, reflecting the society's growing interest in science and its applications. The edition starts with an elaborate architectural overview of Paris's new Labor Exchange, followed by in-depth explorations of things like how to build and take care of underground electrical systems, using liquid carbon dioxide to fight fires, and making gunpowder that doesn't produce smoke, among other breakthroughs. The material acts as a time capsule, archiving the scientific discussions and real-world implementations of that period.