This book is very well written is entered very quickly in history. The scenery and the characters are planted from the beginning is that allows us to (early) know or are the actions and personality of the characters. The story itself is quickly involved, even though there are many technical terms of the creation of the vibrator, they are very simply explained, but under fair terms with theories based, we do not take the head to know what the author speaks. I highly recommend it does not move me from my bedside table.