I'm sure this is basically a very good book, but the Kindle version is unsatisfactory. The problem is that the text and illustrations are so small that you need a magnifying glass to see them. I found (by experiment) that you can tap on the text to make it larger, so this overcomes the miniature text problem, although I can't see why the normal method for Kindle text (with adjustable font size) was not used. However, the diagrams cannot be enlarged, which is a much more serious problem. Again I cannot understand why the normal Kindle method was not used on the diagrams, so that each one could be enlarged to fit the screen. This book only works on the Kindle Fire (or iPad) and cannot be used with the PC application where, with the larger screen, it may actually have been of some use. It is possible that the book may work better with a larger screen iPad but I don't have one of these. This is a very poor implementation of an illustrated book - I know it can be done properly as I have quite a collection of watercolour painting ebooks which are fine.