How It Works-by Archibald Williams is a scientific publication written in the early 20th century. The work aims to explain the fundamental principles behind various physical phenomena and mechanisms encountered in daily life, such as steam, electricity, and sound, using simple language that caters to an audience without an in-depth technical background. At the start of the text, the author shares his motivation for writing, noting the frequency of questions he has received asking for clarification on how various devices operate. He indicates that the text will cover a range of topics, including steam engines, electrical apparatus, and optics, with a focus on fundamental principles rather than exhaustive technical specifics. It includes illustrations and diagrams to enhance understanding, illustrating how common mechanisms function, such as the steam engine's operations, safety measures for boilers, and a comparison of natural organs to man-made machines, signaling a clear intent to demystify complex scientific concepts for the uninitiated.