The line between automata and toys has never been clear, but the principles of engineering that animate them have always been the same. This book explores how mechanical toys work.
The chapters survey the history of toys, material types, methods of construction, sound producing devices, and energy delivery systems. While not overly detailed in its technical descriptions, the reader gets a chance to see many black-and-white and color photographs of exposed toy and automata mechanisms.
Keep an eye out for this one. You may be able to get Mechanical Toys: How Old Toys Work second-hand at a book sale or at Amazon.