This book is a great source of information. I especially liked how the writer distuinguishes between fictional and professionally military opinions on future war. The sociocultural context was also very helpful.
I also have a few issues, however. Although the historical timespan indicated in the title is 1880-1914, I felt there was a very pronounced emphasis on post-1900 material. Moreover (and this is a personal thing for me), it annoyed me that there was almost no material on Griffith. I don't see why the author would dismiss his Angel of the Revolution after mentioning that it was one of the first novels with such explicit aerial warfare, and I definitely don't understand why he does so on the basis that H.G. Wells's narratives have a better sense of characterisation. 1) For someone writing a book on past and future, you're judging a past text by modern standards. 2) Your book isn't about characterisation, it's about machines, and Griffith's airships deserve a more prominent place in this work, if only because they're mode of operating is so specific.