This is a handy companion guide for anybody interested in making, running small dynamos and electrical motors.

Nine remarkable men produced inventions that changed the world. The printing press, the telephone, powered flight, recording and others have made the modern world what it is. But who were the men who had these ideas and made reality of them? As David Angus shows, they were very different quiet, boisterous, confident, withdrawn but all had a moment of vision allied to single-minded determination to battle through numerous prototypes and produced something that really worked. It is a fascinating account for younger listeners.

This practical engineering handbook is in its complete and unabridged original form, extensively illustrated and full of instruction that is as useful and practical today as it was when originally published. Contents include - How A Dynamo Works, General Considerations - Simple Cycle-Lighting Dynamo - Hand-Driven 20-Watt Dynamo - Two Minature Dynamos - Direct-Coupled Dynamo And Water Motor - Three Small Electric Motors - 6-Volt Traction Motor - 60-Watt Simplex Dynamo Or Motor - Winding Data - Faults And Remedies - Various Dynamos And Motors. Many of the earliest books, particularly those dating back to the 1900s and before, are now extremely scarce and increasingly expensive. We are republishing these classic works in affordable, high quality, modern editions, using the original text and artwork.

The Circle of Knowledge is an informative book that was designed in 1917, to be both inspiring and entertaining. The book represents the modern, progressive spirit which fits that time, in its forms of expression and its editorship. The purpose of this work is to answer the why, who, what, when, where, how of the wide majority of curious minds, both young and adult, and encourage them to raise further questions. Special measures were taken in creating this work to isolate essentials from non-essentials; to differentiate human interest subjects of universal significance from those of little concern; to deliver living truths instead of dead vocabulary; and finally, to bring the whole within the knowledge of the intermediate reader, without regard to age, in an acceptable and exciting form. The use of visual outlines and tables; maps, drawings, and diagrams; the illustrated works of great painters, sculptors, and architects all are used to give the reader the valuable and cultural knowledge of past and present.