This book by Nikola Tesla is a good recount of all of his inventions and an overview of them, however the detail is somewhat lacking. It has almost all of his inventions and ideas in it, but there is very little explanation and detail describing them. This can be good when trying to get a good overview of what Tesla accomplished, however if you are trying to get detailed and informative information about these I recommend going and getting a better source after this book because it is nothing more than a good introduction to the nature of his inventions and patents. If you have any background in the field of electricity than these sketches and brief overviews will be no problem to you and you will understand them, but if you have no background than understanding the nature of these will be quite difficult. Nonetheless, this book was still really fun to read and study, the relaxed nature of it allows it to be a fun book to read and learn from without reminding you that it is still a book. Overall, I would say this is a good book to have, especially for the price, the overview it provides is incomparable and it serves as a great introduction to Tesla's life.