The Book of Inventions - Ian Harrison - Google Books

http://books.google.de/books?id=n4NGAAAAYAAJ&q=emil+lerp&dq=emil+lerp&hl=de&sa=X&ei=o11zVLLFEIurPNvCgLAC&ved=0CEsQ6AEwBQ

Combining curious and colorful anecdotes with intricate research and photographs, National Geographic presents a fact-filled and lively history of inventions and their inventors. With a creative and humorous approach to reference, The Book of Inventions is…