The author Adolf Ferdinand Weinhold (1841-1917) was a professor for physics, chemistry and electro-technology in Chemnitz, Germany. This is the third and improved edition of 1899 of his work: PHYSIKALISCHEN DEMONSTRATIONEN (Physical Demonstrations). Anleitung zum Experimentieren im Unterricht an Gymnasien, Realgymnasien, Realschulen und Gewerbeschulen.(Instructions for Experimentation in Teaching at Gymnasiums, Realgymnasiums, Secondary Schools, and Trade Schools) Weinhold waS known for creating highly practical manuals for teachers. This book became one of the most influential 19th century guides for physics demonstrations in schools. Includes: Mechanics experiments — levers, pulleys, inertia, rotation Acoustics — tuning forks, resonance, wave motion Optics — lenses, mirrors, refraction, projection Heat and thermodynamics — expansion, conduction, calorimetry Electricity — electrostatics, induction, Leyden jars Magnetism — magnetic fields, electromagnets Galvanism — early batteries, circuits, electrolysis General laboratory equipment — how to build and maintain apparatus cheaply. The book is very hands on: Weinhold often explains how to construct your own apparatus from wood, glass, metal, and household materials — typical for 19th century science teaching With over 500 b/w illustration on the text pages and 4 folding lithographed plates. Marbled opening -page slightly open at the bottom, following fly-leaf with some brown stains, a number and old library stamp, same on title-page, same library stamp on each of the four folding plates . Altogether in very good condition, inside text and illustrations clean. Heavy book, therefore increased shipping fees. (Shipping via registered airmail. To Italy we ship with EMS. Arrival time 10 - 30 days, depending on destination)