Where does the term "crackpot" come from?

Where does the term crackpot come from?? Someone asked me, but I had no idea, SO i decided to see if anyone here knew…

In reference to another thread in which I posted about the best location at which to obtain crack pipes, I opine that a crack pot is the pot in which one keeps his crack. This may or may not be true. It may also be a reference to a blunt laced with crack. One cannot definitively be sure. However, in order to redeem some redeeming legitimacy to my posts, I’ll add this:

And the OED spaketh