[GZG] Everything old is new again

Here is a design for a railgun/coilgun ... from 1932!
http://blog.modernmechanix.com/2006/08/08/electric-cannon-uses-no-gunpow
der/

And this article from 1950 asks why not build underwater tanks?
http://blog.modernmechanix.com/2006/08/08/why-dont-we-build-underwater-t
anks/