Help where is the horn relay?

The electrical system on the 68 Dodge Dart GT (225 slant six) is giving me fits again. I was stopped and bumped the horn ring by accident and on comes the horn and on and on. You get the drift. I bumped the horn ring a couple of times and it goes out but comes back on. I got home and took the horn ring right off and it still appears to be shorting out.

I looked for the horn relay but was unable to locate. Can someone point me in the right direction?

Thanks