This is the only book that I have yet found that compares to David Diringer's -The Alphabet: A Key to the History of Mankind-.
It is not quite so complete in its coverage of obscure scripts as Diringer, and it makes far fewer attempts to analyse the history of the scripts. On the other hand, because it covers less such territory, the exemplars of the scripts and the tables of the characters and their values in this book are far more legible. The alphabetic arrangement of the material makes it easy to find which system you want.
Another of this book's strengths is that at least some attempt is made to explain how the phonemes of the many languages are expressed by the scripts in question; in many languages, from Tibetan to English, the relationship between alphabet and speech is subtle and complex. Obviously, this information will be cursory and incomplete, but having some is better than having none, and it is at least handy to know whether you are dealing with phonemic or with etymological spellings. This will help you not only to transliterate, but also to read, them.
If you are fascinated by the history of writing, and obscure scripts and arcane alphabets, you NEED this book, and will spend hours leafing through it.