Writing a technical book is, as far as I was aware, well known to be a losing bet, where it's exceedingly rare that authors make back their advances. e.g. http:

Writing a technical book is, as far as I was aware, well known to be a losing bet, where it's exceedingly rare that authors make back their advances. e.g. http://www.voidspace.org.uk/python/articles/technical-writing.shtml http://www.voidspace.org.uk/python/articles/technical-writin...