First question I want to arise is: what is Crane paper #410?. As far as I have looked for it in the web, it seems to be something like a Handbook for those engineers which are involved in fluid flow calculation in professional enterprises. It has lots of tables and formulation (which surely don't enclose any demonstration) Am I correct? I also think it has not got any differential equation into it, in order to avoid engineers a headache when solving a a practical problem. Am I right? If I don't, please feedback me with the right information. If I do, I will post later what is my opinion about this book and its undiscriminated use by students and professionals. Thanks in advance.